23531311521 has 24 divisors (see below), whose sum is σ = 34148840960. Its totient is φ = 15614254656.

The previous prime is 23531311511. The next prime is 23531311543. The reversal of 23531311521 is 12511313532.

23531311521 is a `hidden beast` number, since 2 + 3 + 5 + 3 + 131 + 1 + 521 = 666.

It is not a de Polignac number, because 23531311521 - 2²² = 23527117217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23531311511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1697400 + ... + 1711206.

Almost surely, 2^23531311521 is an apocalyptic number.

It is an amenable number.

23531311521 is a deficient number, since it is larger than the sum of its proper divisors (10617529439).

23531311521 is a wasteful number, since it uses less digits than its factorization.

23531311521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14685 (or 14682 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The spelling of 23531311521 in words is "twenty-three billion, five hundred thirty-one million, three hundred eleven thousand, five hundred twenty-one".