31123332121 has 16 divisors (see below), whose sum is σ = 36815990400. Its totient is φ = 25743287808.

The previous prime is 31123332083. The next prime is 31123332127. The reversal of 31123332121 is 12123332113.

It is a de Polignac number, because none of the positive numbers 2^k-31123332121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31123332092 and 31123332101.

It is not an unprimeable number, because it can be changed into a prime (31123332127) 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, 342886 + ... + 424048.

It is an arithmetic number, because the mean of its divisors is an integer number (2300999400).

Almost surely, 2^31123332121 is an apocalyptic number.

It is an amenable number.

31123332121 is a deficient number, since it is larger than the sum of its proper divisors (5692658279).

31123332121 is a wasteful number, since it uses less digits than its factorization.

31123332121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83088.

The product of its digits is 648, while the sum is 22.

Adding to 31123332121 its reverse (12123332113), we get a palindrome (43246664234).

The spelling of 31123332121 in words is "thirty-one billion, one hundred twenty-three million, three hundred thirty-two thousand, one hundred twenty-one".