231426520443521 has 16 divisors (see below), whose sum is σ = 252742071149568. Its totient is φ = 210612977198400.

The previous prime is 231426520443511. The next prime is 231426520443539. The reversal of 231426520443521 is 125344025624132.

It is a cyclic number.

It is not a de Polignac number, because 231426520443521 - 2²² = 231426516249217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231426520443511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72043856 + ... + 75187566.

It is an arithmetic number, because the mean of its divisors is an integer number (15796379446848).

Almost surely, 2^{231426520443521} is an apocalyptic number.

It is an amenable number.

231426520443521 is a deficient number, since it is larger than the sum of its proper divisors (21315550706047).

231426520443521 is a wasteful number, since it uses less digits than its factorization.

231426520443521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223552.

The product of its (nonzero) digits is 1382400, while the sum is 44.

The spelling of 231426520443521 in words is "two hundred thirty-one trillion, four hundred twenty-six billion, five hundred twenty million, four hundred forty-three thousand, five hundred twenty-one".