231001223121 has 24 divisors (see below), whose sum is σ = 334076258880. Its totient is φ = 153812717856.

The previous prime is 231001223113. The next prime is 231001223149. The reversal of 231001223121 is 121322100132.

231001223121 is a `hidden beast` number, since 231 + 0 + 0 + 122 + 312 + 1 = 666.

It is not a de Polignac number, because 231001223121 - 2³ = 231001223113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231001223094 and 231001223103.

It is not an unprimeable number, because it can be changed into a prime (231001263121) 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, 34582860 + ... + 34589538.

It is an arithmetic number, because the mean of its divisors is an integer number (13919844120).

Almost surely, 2^231001223121 is an apocalyptic number.

It is an amenable number.

231001223121 is a deficient number, since it is larger than the sum of its proper divisors (103075035759).

231001223121 is a wasteful number, since it uses less digits than its factorization.

231001223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10805 (or 10802 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 231001223121 its reverse (121322100132), we get a palindrome (352323323253).

The spelling of 231001223121 in words is "two hundred thirty-one billion, one million, two hundred twenty-three thousand, one hundred twenty-one".