231512220402 has 128 divisors (see below), whose sum is σ = 523581843456. Its totient is φ = 67891200000.

The previous prime is 231512220397. The next prime is 231512220403. The reversal of 231512220402 is 204022215132.

It is not an unprimeable number, because it can be changed into a prime (231512220403) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13085002 + ... + 13102682.

It is an arithmetic number, because the mean of its divisors is an integer number (4090483152).

Almost surely, 2^231512220402 is an apocalyptic number.

231512220402 is an abundant number, since it is smaller than the sum of its proper divisors (292069623054).

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

231512220402 is a wasteful number, since it uses less digits than its factorization.

231512220402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17876.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 231512220402 its reverse (204022215132), we get a palindrome (435534435534).

The spelling of 231512220402 in words is "two hundred thirty-one billion, five hundred twelve million, two hundred twenty thousand, four hundred two".