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21031202401242 = 231114391723128521
BaseRepresentation
bin1001100100000101101010…
…10110010010101111011010
32202110120012122201010221020
410302002311112102233122
510224033400303314432
6112421333452223310
74300311541555515
oct462026526225732
982416178633836
1021031202401242
1167793125228a0
122437ba316ab36
13b97306a99a97
14529cb66a5d7c
1526710aa8822c
hex1320b5592bda

21031202401242 has 64 divisors (see below), whose sum is σ = 45945154990080. Its totient is φ = 6364917014400.

The previous prime is 21031202401193. The next prime is 21031202401243. The reversal of 21031202401242 is 24210420213012.

It is a super-2 number, since 2×210312024012422 (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21031202401243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 163575942 + ... + 163704462.

It is an arithmetic number, because the mean of its divisors is an integer number (717893046720).

Almost surely, 221031202401242 is an apocalyptic number.

21031202401242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21031202401242 is an abundant number, since it is smaller than the sum of its proper divisors (24913952588838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21031202401242 is a wasteful number, since it uses less digits than its factorization.

21031202401242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131699.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21031202401242 its reverse (24210420213012), we get a palindrome (45241622614254).

The spelling of 21031202401242 in words is "twenty-one trillion, thirty-one billion, two hundred two million, four hundred one thousand, two hundred forty-two".

Divisors: 1 2 3 6 11 22 33 66 1439 1723 2878 3446 4317 5169 8634 10338 15829 18953 31658 37906 47487 56859 94974 113718 128521 257042 385563 771126 1413731 2479397 2827462 4241193 4958794 7438191 8482386 14876382 27273367 54546734 81820101 163640202 184941719 221441683 369883438 442883366 554825157 664325049 1109650314 1328650098 2034358909 2435858513 4068717818 4871717026 6103076727 7307575539 12206153454 14615151078 318654581837 637309163674 955963745511 1911927491022 3505200400207 7010400800414 10515601200621 21031202401242