21021031323210 has 32 divisors (see below), whose sum is σ = 50490867960000. Its totient is φ = 5601120265728.

The previous prime is 21021031323163. The next prime is 21021031323221. The reversal of 21021031323210 is 1232313012012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280467352 + ... + 280542291.

It is an arithmetic number, because the mean of its divisors is an integer number (1577839623750).

Almost surely, 2^{21021031323210} is an apocalyptic number.

21021031323210 is an abundant number, since it is smaller than the sum of its proper divisors (29469836636790).

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

21021031323210 is a wasteful number, since it uses less digits than its factorization.

21021031323210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561010902.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21021031323210 its reverse (1232313012012), we get a palindrome (22253344335222).

The spelling of 21021031323210 in words is "twenty-one trillion, twenty-one billion, thirty-one million, three hundred twenty-three thousand, two hundred ten".