231212131002 has 24 divisors (see below), whose sum is σ = 509450460480. Its totient is φ = 75764426760.

The previous prime is 231212131001. The next prime is 231212131039. The reversal of 231212131002 is 200131212132.

231212131002 is a `hidden beast` number, since 231 + 2 + 121 + 310 + 0 + 2 = 666.

231212131002 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (231212131001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108855874 + ... + 108857997.

It is an arithmetic number, because the mean of its divisors is an integer number (21227102520).

Almost surely, 2^231212131002 is an apocalyptic number.

231212131002 is an abundant number, since it is smaller than the sum of its proper divisors (278238329478).

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

231212131002 is a wasteful number, since it uses less digits than its factorization.

231212131002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217713938 (or 217713935 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 231212131002 its reverse (200131212132), we get a palindrome (431343343134).

The spelling of 231212131002 in words is "two hundred thirty-one billion, two hundred twelve million, one hundred thirty-one thousand, two".