231221012 has 48 divisors (see below), whose sum is σ = 477404928. Its totient is φ = 96798720.

The previous prime is 231221009. The next prime is 231221069. The reversal of 231221012 is 210122132.

It is a happy number.

It is a congruent number.

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, 31868 + ... + 38444.

It is an arithmetic number, because the mean of its divisors is an integer number (9945936).

Almost surely, 2^231221012 is an apocalyptic number.

231221012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

231221012 is an abundant number, since it is smaller than the sum of its proper divisors (246183916).

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

231221012 is a wasteful number, since it uses less digits than its factorization.

231221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6656 (or 6654 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 231221012 is about 15205.9531763057. The cubic root of 231221012 is about 613.7748646740.

Adding to 231221012 its reverse (210122132), we get a palindrome (441343144).

The spelling of 231221012 in words is "two hundred thirty-one million, two hundred twenty-one thousand, twelve".