31311130133821 has 2 divisors, whose sum is σ = 31311130133822. Its totient is φ = 31311130133820.

The previous prime is 31311130133819. The next prime is 31311130133827. The reversal of 31311130133821 is 12833103111313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30676765672921 + 634364460900 = 5538661^2 + 796470^2 .

It is a cyclic number.

It is not a de Polignac number, because 31311130133821 - 2¹ = 31311130133819 is a prime.

Together with 31311130133819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31311130133827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655565066910 + 15655565066911.

It is an arithmetic number, because the mean of its divisors is an integer number (15655565066911).

Almost surely, 2^{31311130133821} is an apocalyptic number.

It is an amenable number.

31311130133821 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311130133821 is an equidigital number, since it uses as much as digits as its factorization.

31311130133821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The spelling of 31311130133821 in words is "thirty-one trillion, three hundred eleven billion, one hundred thirty million, one hundred thirty-three thousand, eight hundred twenty-one".