31313332121 has 16 divisors (see below), whose sum is σ = 33303179520. Its totient is φ = 29340092160.

The previous prime is 31313332103. The next prime is 31313332133. The reversal of 31313332121 is 12123331313.

It is a cyclic number.

It is not a de Polignac number, because 31313332121 - 2²⁶ = 31246223257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31313332151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11695835 + ... + 11698511.

It is an arithmetic number, because the mean of its divisors is an integer number (2081448720).

Almost surely, 2^31313332121 is an apocalyptic number.

It is an amenable number.

31313332121 is a deficient number, since it is larger than the sum of its proper divisors (1989847399).

31313332121 is a wasteful number, since it uses less digits than its factorization.

31313332121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5504.

The product of its digits is 972, while the sum is 23.

Adding to 31313332121 its reverse (12123331313), we get a palindrome (43436663434).

The spelling of 31313332121 in words is "thirty-one billion, three hundred thirteen million, three hundred thirty-two thousand, one hundred twenty-one".