121231031121 has 24 divisors (see below), whose sum is σ = 175923981480. Its totient is φ = 80445885696.

The previous prime is 121231031071. The next prime is 121231031123. The reversal of 121231031121 is 121130132121.

121231031121 is a `hidden beast` number, since 1 + 21 + 2 + 310 + 311 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 971194896 + 120259836225 = 31164^2 + 346785^2 .

It is not a de Polignac number, because 121231031121 - 2¹⁰ = 121231030097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121231031094 and 121231031103.

It is not an unprimeable number, because it can be changed into a prime (121231031123) 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, 11818831 + ... + 11829083.

It is an arithmetic number, because the mean of its divisors is an integer number (7330165895).

Almost surely, 2^121231031121 is an apocalyptic number.

It is an amenable number.

121231031121 is a deficient number, since it is larger than the sum of its proper divisors (54692950359).

121231031121 is a wasteful number, since it uses less digits than its factorization.

121231031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16225 (or 16222 counting only the distinct ones).

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

Adding to 121231031121 its reverse (121130132121), we get a palindrome (242361163242).

The spelling of 121231031121 in words is "one hundred twenty-one billion, two hundred thirty-one million, thirty-one thousand, one hundred twenty-one".