231012220 has 12 divisors (see below), whose sum is σ = 485125704. Its totient is φ = 92404880.

The previous prime is 231012169. The next prime is 231012233. The reversal of 231012220 is 22210132.

231012220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 231012220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5775286 + ... + 5775325.

It is an arithmetic number, because the mean of its divisors is an integer number (40427142).

Almost surely, 2^231012220 is an apocalyptic number.

231012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231012220 is an abundant number, since it is smaller than the sum of its proper divisors (254113484).

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

231012220 is a wasteful number, since it uses less digits than its factorization.

231012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11550620 (or 11550618 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 231012220 is about 15199.0861567398. The cubic root of 231012220 is about 613.5900633113.

Adding to 231012220 its reverse (22210132), we get a palindrome (253222352).

The spelling of 231012220 in words is "two hundred thirty-one million, twelve thousand, two hundred twenty".