31313012121 has 24 divisors (see below), whose sum is σ = 46106099520. Its totient is φ = 20472631200.

The previous prime is 31313012117. The next prime is 31313012161. The reversal of 31313012121 is 12121031313.

It is not a de Polignac number, because 31313012121 - 2² = 31313012117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31313012094 and 31313012103.

It is not an unprimeable number, because it can be changed into a prime (31313012161) 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, 153516 + ... + 293586.

It is an arithmetic number, because the mean of its divisors is an integer number (1921087480).

Almost surely, 2^31313012121 is an apocalyptic number.

It is an amenable number.

31313012121 is a deficient number, since it is larger than the sum of its proper divisors (14793087399).

31313012121 is a wasteful number, since it uses less digits than its factorization.

31313012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140557 (or 140554 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31313012121 its reverse (12121031313), we get a palindrome (43434043434).

The spelling of 31313012121 in words is "thirty-one billion, three hundred thirteen million, twelve thousand, one hundred twenty-one".