21023131312210 has 16 divisors (see below), whose sum is σ = 39146520375000. Its totient is φ = 8119278299776.

The previous prime is 21023131312159. The next prime is 21023131312237. The reversal of 21023131312210 is 1221313132012.

It can be written as a sum of positive squares in 4 ways, for example, as 13502148673729 + 7520982638481 = 3674527^2 + 2742441^2 .

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, 36246777835 + ... + 36246778414.

Almost surely, 2^{21023131312210} is an apocalyptic number.

21023131312210 is a deficient number, since it is larger than the sum of its proper divisors (18123389062790).

21023131312210 is a wasteful number, since it uses less digits than its factorization.

21023131312210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72493556285.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21023131312210 its reverse (1221313132012), we get a palindrome (22244444444222).

The spelling of 21023131312210 in words is "twenty-one trillion, twenty-three billion, one hundred thirty-one million, three hundred twelve thousand, two hundred ten".