231520000122251 has 24 divisors (see below), whose sum is σ = 270139970042880. Its totient is φ = 197457358995072.

The previous prime is 231520000122241. The next prime is 231520000122253. The reversal of 231520000122251 is 152221000025132.

It is a happy number.

It is not a de Polignac number, because 231520000122251 - 2⁴⁶ = 161151255944587 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231520000122251.

It is not an unprimeable number, because it can be changed into a prime (231520000122253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 916472411 + ... + 916724996.

It is an arithmetic number, because the mean of its divisors is an integer number (11255832085120).

Almost surely, 2^{231520000122251} is an apocalyptic number.

231520000122251 is a deficient number, since it is larger than the sum of its proper divisors (38619969920629).

231520000122251 is a wasteful number, since it uses less digits than its factorization.

231520000122251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1833197483 (or 1833197466 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 231520000122251 its reverse (152221000025132), we get a palindrome (383741000147383).

The spelling of 231520000122251 in words is "two hundred thirty-one trillion, five hundred twenty billion, one hundred twenty-two thousand, two hundred fifty-one".