231213012 has 24 divisors (see below), whose sum is σ = 543074112. Its totient is φ = 76560000.

The previous prime is 231213007. The next prime is 231213019. The reversal of 231213012 is 210312132.

It is a super-2 number, since 2×231213012² = 106918913836224288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231212982 and 231213000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231213019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61989 + ... + 65612.

It is an arithmetic number, because the mean of its divisors is an integer number (22628088).

Almost surely, 2^231213012 is an apocalyptic number.

It is an amenable number.

231213012 is an abundant number, since it is smaller than the sum of its proper divisors (311861100).

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

231213012 is a wasteful number, since it uses less digits than its factorization.

231213012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127759 (or 127757 counting only the distinct ones).

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

The square root of 231213012 is about 15205.6901191626. The cubic root of 231213012 is about 613.7677859409.

Adding to 231213012 its reverse (210312132), we get a palindrome (441525144).

The spelling of 231213012 in words is "two hundred thirty-one million, two hundred thirteen thousand, twelve".