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21011101101 = 3217231354943
BaseRepresentation
bin10011100100010110…
…111111010110101101
32000020022002112012200
4103210112333112231
5321012320213401
613352524452113
71342450261344
oct234426772655
960208075180
1021011101101
118a02245271
1240a46aa039
131c9b000903
1410346c2b5b
1582e8e1686
hex4e45bf5ad

21011101101 has 12 divisors (see below), whose sum is σ = 30367004928. Its totient is φ = 13999260744.

The previous prime is 21011101009. The next prime is 21011101103. The reversal of 21011101101 is 10110111012.

It is not a de Polignac number, because 21011101101 - 218 = 21010838957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011101103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 661965 + ... + 692978.

It is an arithmetic number, because the mean of its divisors is an integer number (2530583744).

Almost surely, 221011101101 is an apocalyptic number.

It is an amenable number.

21011101101 is a deficient number, since it is larger than the sum of its proper divisors (9355903827).

21011101101 is a wasteful number, since it uses less digits than its factorization.

21011101101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356672 (or 1356669 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 21011101101 its reverse (10110111012), we get a palindrome (31121212113).

The spelling of 21011101101 in words is "twenty-one billion, eleven million, one hundred one thousand, one hundred one".

Divisors: 1 3 9 1723 5169 15507 1354943 4064829 12194487 2334566789 7003700367 21011101101