31010113021 has 2 divisors, whose sum is σ = 31010113022. Its totient is φ = 31010113020.

The previous prime is 31010113019. The next prime is 31010113063. The reversal of 31010113021 is 12031101013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30002050521 + 1008062500 = 173211^2 + 31750^2 .

It is a cyclic number.

It is not a de Polignac number, because 31010113021 - 2¹ = 31010113019 is a prime.

Together with 31010113019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31010112992 and 31010113010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31010113081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15505056510 + 15505056511.

It is an arithmetic number, because the mean of its divisors is an integer number (15505056511).

Almost surely, 2^31010113021 is an apocalyptic number.

It is an amenable number.

31010113021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31010113021 is an equidigital number, since it uses as much as digits as its factorization.

31010113021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 31010113021 its reverse (12031101013), we get a palindrome (43041214034).

The spelling of 31010113021 in words is "thirty-one billion, ten million, one hundred thirteen thousand, twenty-one".