231550510150021 has 4 divisors (see below), whose sum is σ = 231557054672844. Its totient is φ = 231543965627200.

The previous prime is 231550510149983. The next prime is 231550510150033. The reversal of 231550510150021 is 120051015055132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 154775868401025 + 76774641748996 = 12440895^2 + 8762114^2 .

It is a cyclic number.

It is not a de Polignac number, because 231550510150021 - 2²⁵ = 231550476595589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231550520150021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3272208340 + ... + 3272279101.

It is an arithmetic number, because the mean of its divisors is an integer number (57889263668211).

Almost surely, 2^{231550510150021} is an apocalyptic number.

It is an amenable number.

231550510150021 is a deficient number, since it is larger than the sum of its proper divisors (6544522823).

231550510150021 is an equidigital number, since it uses as much as digits as its factorization.

231550510150021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6544522822.

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 231550510150021 in words is "two hundred thirty-one trillion, five hundred fifty billion, five hundred ten million, one hundred fifty thousand, twenty-one".