231051215553421 has 4 divisors (see below), whose sum is σ = 231297801696892. Its totient is φ = 230804629409952.

The previous prime is 231051215553407. The next prime is 231051215553439. The reversal of 231051215553421 is 124355512150132.

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 128742744548196 + 102308471005225 = 11346486^2 + 10114765^2 .

It is a cyclic number.

It is not a de Polignac number, because 231051215553421 - 2⁷ = 231051215553293 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 (231051215553451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123293070330 + ... + 123293072203.

It is an arithmetic number, because the mean of its divisors is an integer number (57824450424223).

Almost surely, 2^{231051215553421} is an apocalyptic number.

It is an amenable number.

231051215553421 is a deficient number, since it is larger than the sum of its proper divisors (246586143471).

231051215553421 is an equidigital number, since it uses as much as digits as its factorization.

231051215553421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246586143470.

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 231051215553421 in words is "two hundred thirty-one trillion, fifty-one billion, two hundred fifteen million, five hundred fifty-three thousand, four hundred twenty-one".