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21020332120 = 2355314896659
BaseRepresentation
bin10011100100111010…
…001101000001011000
32000020221110111210021
4103210322031001120
5321022201111440
613353454400224
71342621606054
oct234472150130
960227414707
1021020332120
118a0747a707
1240a7800074
131c9cbb3458
141035a06c64
1583061684a
hex4e4e8d058

21020332120 has 64 divisors (see below), whose sum is σ = 48227724000. Its totient is φ = 8242710528.

The previous prime is 21020332051. The next prime is 21020332133. The reversal of 21020332120 is 2123302012.

It is a junction number, because it is equal to n+sod(n) for n = 21020332094 and 21020332103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3153351 + ... + 3160009.

Almost surely, 221020332120 is an apocalyptic number.

21020332120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020332120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24113862000).

21020332120 is an abundant number, since it is smaller than the sum of its proper divisors (27207391880).

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

21020332120 is a wasteful number, since it uses less digits than its factorization.

21020332120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8212 (or 8208 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21020332120 its reverse (2123302012), we get a palindrome (23143634132).

The spelling of 21020332120 in words is "twenty-one billion, twenty million, three hundred thirty-two thousand, one hundred twenty".

Divisors: 1 2 4 5 8 10 20 40 53 106 212 265 424 530 1060 1489 2120 2978 5956 6659 7445 11912 13318 14890 26636 29780 33295 53272 59560 66590 78917 133180 157834 266360 315668 352927 394585 631336 705854 789170 1411708 1578340 1764635 2823416 3156680 3529270 7058540 9915251 14117080 19830502 39661004 49576255 79322008 99152510 198305020 396610040 525508303 1051016606 2102033212 2627541515 4204066424 5255083030 10510166060 21020332120