231212013220 has 48 divisors (see below), whose sum is σ = 515632506480. Its totient is φ = 86786187264.

The previous prime is 231212013217. The next prime is 231212013229. The reversal of 231212013220 is 22310212132.

It can be written as a sum of positive squares in 8 ways, for example, as 2513819044 + 228698194176 = 50138^2 + 478224^2 .

It is not an unprimeable number, because it can be changed into a prime (231212013229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 894375 + ... + 1123534.

It is an arithmetic number, because the mean of its divisors is an integer number (10742343885).

Almost surely, 2^231212013220 is an apocalyptic number.

231212013220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231212013220 is an abundant number, since it is smaller than the sum of its proper divisors (284420493260).

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

231212013220 is a wasteful number, since it uses less digits than its factorization.

231212013220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2018272 (or 2018270 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 231212013220 its reverse (22310212132), we get a palindrome (253522225352).

The spelling of 231212013220 in words is "two hundred thirty-one billion, two hundred twelve million, thirteen thousand, two hundred twenty".