31212122323931 has 2 divisors, whose sum is σ = 31212122323932. Its totient is φ = 31212122323930.

The previous prime is 31212122323873. The next prime is 31212122323951. The reversal of 31212122323931 is 13932322121213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31212122323931 - 2¹⁴ = 31212122307547 is a prime.

It is a super-2 number, since 2×31212122323931² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31212122323891 and 31212122323900.

It is not a weakly prime, because it can be changed into another prime (31212122323951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606061161965 + 15606061161966.

It is an arithmetic number, because the mean of its divisors is an integer number (15606061161966).

Almost surely, 2^{31212122323931} is an apocalyptic number.

31212122323931 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212122323931 is an equidigital number, since it uses as much as digits as its factorization.

31212122323931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 35.

The spelling of 31212122323931 in words is "thirty-one trillion, two hundred twelve billion, one hundred twenty-two million, three hundred twenty-three thousand, nine hundred thirty-one".