31212013199923 has 2 divisors, whose sum is σ = 31212013199924. Its totient is φ = 31212013199922.

The previous prime is 31212013199891. The next prime is 31212013199977. The reversal of 31212013199923 is 32999131021213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31212013199923 - 2⁵ = 31212013199891 is a prime.

It is not a weakly prime, because it can be changed into another prime (31212013199993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606006599961 + 15606006599962.

It is an arithmetic number, because the mean of its divisors is an integer number (15606006599962).

Almost surely, 2^{31212013199923} is an apocalyptic number.

31212013199923 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212013199923 is an equidigital number, since it uses as much as digits as its factorization.

31212013199923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 46.

The spelling of 31212013199923 in words is "thirty-one trillion, two hundred twelve billion, thirteen million, one hundred ninety-nine thousand, nine hundred twenty-three".