31268178262021 has 2 divisors, whose sum is σ = 31268178262022. Its totient is φ = 31268178262020.

The previous prime is 31268178261989. The next prime is 31268178262073. The reversal of 31268178262021 is 12026287186213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22526044237921 + 8742134024100 = 4746161^2 + 2956710^2 .

It is a cyclic number.

It is not a de Polignac number, because 31268178262021 - 2⁵ = 31268178261989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31268178262091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15634089131010 + 15634089131011.

It is an arithmetic number, because the mean of its divisors is an integer number (15634089131011).

Almost surely, 2^{31268178262021} is an apocalyptic number.

It is an amenable number.

31268178262021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31268178262021 is an equidigital number, since it uses as much as digits as its factorization.

31268178262021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 31268178262021 in words is "thirty-one trillion, two hundred sixty-eight billion, one hundred seventy-eight million, two hundred sixty-two thousand, twenty-one".