231012331220 has 72 divisors (see below), whose sum is σ = 564604570152. Its totient is φ = 79063029760.

The previous prime is 231012331189. The next prime is 231012331247. The reversal of 231012331220 is 22133210132.

It can be written as a sum of positive squares in 4 ways, for example, as 27472399504 + 203539931716 = 165748^2 + 451154^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 231012331192 and 231012331201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2766497 + ... + 2848776.

It is an arithmetic number, because the mean of its divisors is an integer number (7841730141).

Almost surely, 2^231012331220 is an apocalyptic number.

231012331220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231012331220 is an abundant number, since it is smaller than the sum of its proper divisors (333592238932).

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

231012331220 is a wasteful number, since it uses less digits than its factorization.

231012331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5615321 (or 5615308 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 231012331220 its reverse (22133210132), we get a palindrome (253145541352).

The spelling of 231012331220 in words is "two hundred thirty-one billion, twelve million, three hundred thirty-one thousand, two hundred twenty".