21031312102010 has 64 divisors (see below), whose sum is σ = 44758282821120. Its totient is φ = 6961779498240.

The previous prime is 21031312101971. The next prime is 21031312102027. The reversal of 21031312102010 is 1020121313012.

It is a self number, because there is not a number n which added to its sum of digits gives 21031312102010.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47833292 + ... + 48270968.

It is an arithmetic number, because the mean of its divisors is an integer number (699348169080).

Almost surely, 2^{21031312102010} is an apocalyptic number.

21031312102010 is an abundant number, since it is smaller than the sum of its proper divisors (23726970719110).

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

21031312102010 is a wasteful number, since it uses less digits than its factorization.

21031312102010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461391.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21031312102010 its reverse (1020121313012), we get a palindrome (22051433415022).

The spelling of 21031312102010 in words is "twenty-one trillion, thirty-one billion, three hundred twelve million, one hundred two thousand, ten".