21021232013220 has 96 divisors (see below), whose sum is σ = 59082328811520. Its totient is φ = 5584439272320.

The previous prime is 21021232013213. The next prime is 21021232013261. The reversal of 21021232013220 is 2231023212012.

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, 186006691 + ... + 186119669.

It is an arithmetic number, because the mean of its divisors is an integer number (615440925120).

Almost surely, 2^{21021232013220} is an apocalyptic number.

21021232013220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021232013220 is an abundant number, since it is smaller than the sum of its proper divisors (38061096798300).

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

21021232013220 is a wasteful number, since it uses less digits than its factorization.

21021232013220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124705 (or 124703 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21021232013220 its reverse (2231023212012), we get a palindrome (23252255225232).

The spelling of 21021232013220 in words is "twenty-one trillion, twenty-one billion, two hundred thirty-two million, thirteen thousand, two hundred twenty".