231521555023402 has 16 divisors (see below), whose sum is σ = 400603384929600. Its totient is φ = 98296200930528.

The previous prime is 231521555023391. The next prime is 231521555023403. The reversal of 231521555023402 is 204320555125132.

It is not an unprimeable number, because it can be changed into a prime (231521555023403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77276886027 + ... + 77276889022.

It is an arithmetic number, because the mean of its divisors is an integer number (25037711558100).

Almost surely, 2^{231521555023402} is an apocalyptic number.

231521555023402 is a deficient number, since it is larger than the sum of its proper divisors (169081829906198).

231521555023402 is a wasteful number, since it uses less digits than its factorization.

231521555023402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154553775165.

The product of its (nonzero) digits is 360000, while the sum is 40.

The spelling of 231521555023402 in words is "two hundred thirty-one trillion, five hundred twenty-one billion, five hundred fifty-five million, twenty-three thousand, four hundred two".