31312101323021 has 2 divisors, whose sum is σ = 31312101323022. Its totient is φ = 31312101323020.

The previous prime is 31312101322993. The next prime is 31312101323039. The reversal of 31312101323021 is 12032310121313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22159897204900 + 9152204118121 = 4707430^2 + 3025261^2 .

It is a cyclic number.

It is not a de Polignac number, because 31312101323021 - 2²⁶ = 31312034214157 is a prime.

It is a super-3 number, since 3×31312101323021³ (a number of 41 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31312101343021) 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, 15656050661510 + 15656050661511.

It is an arithmetic number, because the mean of its divisors is an integer number (15656050661511).

Almost surely, 2^{31312101323021} is an apocalyptic number.

It is an amenable number.

31312101323021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312101323021 is an equidigital number, since it uses as much as digits as its factorization.

31312101323021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31312101323021 its reverse (12032310121313), we get a palindrome (43344411444334).

The spelling of 31312101323021 in words is "thirty-one trillion, three hundred twelve billion, one hundred one million, three hundred twenty-three thousand, twenty-one".