21102302031020 has 24 divisors (see below), whose sum is σ = 50645524874784. Its totient is φ = 7235074982016.

The previous prime is 21102302031017. The next prime is 21102302031047. The reversal of 21102302031020 is 2013020320112.

It is a self number, because there is not a number n which added to its sum of digits gives 21102302031020.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75365364257 + ... + 75365364536.

It is an arithmetic number, because the mean of its divisors is an integer number (2110230203116).

Almost surely, 2^{21102302031020} is an apocalyptic number.

21102302031020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102302031020 is an abundant number, since it is smaller than the sum of its proper divisors (29543222843764).

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

21102302031020 is a wasteful number, since it uses less digits than its factorization.

21102302031020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150730728809 (or 150730728807 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21102302031020 its reverse (2013020320112), we get a palindrome (23115322351132).

The spelling of 21102302031020 in words is "twenty-one trillion, one hundred two billion, three hundred two million, thirty-one thousand, twenty".