21102323031020 has 192 divisors, whose sum is σ = 59111006653440. Its totient is φ = 6129020390400.

The previous prime is 21102323031017. The next prime is 21102323031047. The reversal of 21102323031020 is 2013032320112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21102323030983 and 21102323031001.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4126619 + ... + 7696338.

It is an arithmetic number, because the mean of its divisors is an integer number (307869826320).

Almost surely, 2^{21102323031020} is an apocalyptic number.

21102323031020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102323031020 is an abundant number, since it is smaller than the sum of its proper divisors (38008683622420).

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

21102323031020 is a wasteful number, since it uses less digits than its factorization.

21102323031020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11823064 (or 11823062 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21102323031020 its reverse (2013032320112), we get a palindrome (23115355351132).

The spelling of 21102323031020 in words is "twenty-one trillion, one hundred two billion, three hundred twenty-three million, thirty-one thousand, twenty".