231123011121 has 16 divisors (see below), whose sum is σ = 350367357120. Its totient is φ = 150498704160.

The previous prime is 231123011101. The next prime is 231123011123. The reversal of 231123011121 is 121110321132.

231123011121 is a `hidden beast` number, since 2 + 311 + 230 + 1 + 1 + 121 = 666.

It is not a de Polignac number, because 231123011121 - 2¹⁷ = 231122880049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231123011094 and 231123011103.

It is not an unprimeable number, because it can be changed into a prime (231123011123) 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, 99535020 + ... + 99537341.

It is an arithmetic number, because the mean of its divisors is an integer number (21897959820).

Almost surely, 2^231123011121 is an apocalyptic number.

It is an amenable number.

231123011121 is a deficient number, since it is larger than the sum of its proper divisors (119244345999).

231123011121 is a wasteful number, since it uses less digits than its factorization.

231123011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199072413 (or 199072407 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 231123011121 its reverse (121110321132), we get a palindrome (352233332253).

The spelling of 231123011121 in words is "two hundred thirty-one billion, one hundred twenty-three million, eleven thousand, one hundred twenty-one".