31102012121 has 2 divisors, whose sum is σ = 31102012122. Its totient is φ = 31102012120.

The previous prime is 31102012087. The next prime is 31102012127. The reversal of 31102012121 is 12121020113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29194506496 + 1907505625 = 170864^2 + 43675^2 .

It is a cyclic number.

It is not a de Polignac number, because 31102012121 - 2³⁴ = 13922142937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31102012096 and 31102012105.

It is not a weakly prime, because it can be changed into another prime (31102012127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15551006060 + 15551006061.

It is an arithmetic number, because the mean of its divisors is an integer number (15551006061).

Almost surely, 2^31102012121 is an apocalyptic number.

It is an amenable number.

31102012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31102012121 is an equidigital number, since it uses as much as digits as its factorization.

31102012121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 31102012121 its reverse (12121020113), we get a palindrome (43223032234).

The spelling of 31102012121 in words is "thirty-one billion, one hundred two million, twelve thousand, one hundred twenty-one".