231520000122520 has 64 divisors (see below), whose sum is σ = 522365110898400. Its totient is φ = 92351444183040.

The previous prime is 231520000122511. The next prime is 231520000122569. The reversal of 231520000122520 is 25221000025132.

It is a super-2 number, since 2×231520000122520² (a number of 30 digits) contains 22 as substring.

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, 15498880 + ... + 26518960.

Almost surely, 2^{231520000122520} is an apocalyptic number.

231520000122520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231520000122520 is an abundant number, since it is smaller than the sum of its proper divisors (290845110775880).

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

231520000122520 is a wasteful number, since it uses less digits than its factorization.

231520000122520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11021548 (or 11021544 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 231520000122520 its reverse (25221000025132), we get a palindrome (256741000147652).

The spelling of 231520000122520 in words is "two hundred thirty-one trillion, five hundred twenty billion, one hundred twenty-two thousand, five hundred twenty".