31213021093 has 2 divisors, whose sum is σ = 31213021094. Its totient is φ = 31213021092.

The previous prime is 31213020997. The next prime is 31213021157. The reversal of 31213021093 is 39012031213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25671409729 + 5541611364 = 160223^2 + 74442^2 .

It is a cyclic number.

It is not a de Polignac number, because 31213021093 - 2⁹ = 31213020581 is a prime.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606510546 + 15606510547.

It is an arithmetic number, because the mean of its divisors is an integer number (15606510547).

Almost surely, 2^31213021093 is an apocalyptic number.

It is an amenable number.

31213021093 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213021093 is an equidigital number, since it uses as much as digits as its factorization.

31213021093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 31213021093 in words is "thirty-one billion, two hundred thirteen million, twenty-one thousand, ninety-three".