31213020210 has 32 divisors (see below), whose sum is σ = 74980242432. Its totient is φ = 8315806080.

The previous prime is 31213020169. The next prime is 31213020227. The reversal of 31213020210 is 1202031213.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31213020210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445971 + ... + 511190.

It is an arithmetic number, because the mean of its divisors is an integer number (2343132576).

Almost surely, 2^31213020210 is an apocalyptic number.

31213020210 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31213020210 is an abundant number, since it is smaller than the sum of its proper divisors (43767222222).

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

31213020210 is a wasteful number, since it uses less digits than its factorization.

31213020210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958258.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31213020210 its reverse (1202031213), we get a palindrome (32415051423).

The spelling of 31213020210 in words is "thirty-one billion, two hundred thirteen million, twenty thousand, two hundred ten".