21023202131220 has 24 divisors (see below), whose sum is σ = 58864965967584. Its totient is φ = 5606187234976.

The previous prime is 21023202131219. The next prime is 21023202131287. The reversal of 21023202131220 is 2213120232012.

It is a congruent number.

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, 175193351034 + ... + 175193351153.

It is an arithmetic number, because the mean of its divisors is an integer number (2452706915316).

Almost surely, 2^{21023202131220} is an apocalyptic number.

21023202131220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023202131220 is an abundant number, since it is smaller than the sum of its proper divisors (37841763836364).

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

21023202131220 is a wasteful number, since it uses less digits than its factorization.

21023202131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350386702199 (or 350386702197 counting only the distinct ones).

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

Adding to 21023202131220 its reverse (2213120232012), we get a palindrome (23236322363232).

The spelling of 21023202131220 in words is "twenty-one trillion, twenty-three billion, two hundred two million, one hundred thirty-one thousand, two hundred twenty".