102020211211931 has 2 divisors, whose sum is σ = 102020211211932. Its totient is φ = 102020211211930.

The previous prime is 102020211211909. The next prime is 102020211211979. The reversal of 102020211211931 is 139112112020201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102020211211931 - 2⁴⁶ = 31651467034267 is a prime.

It is a super-2 number, since 2×102020211211931² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 102020211211931.

It is not a weakly prime, because it can be changed into another prime (102020211211981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010105605965 + 51010105605966.

It is an arithmetic number, because the mean of its divisors is an integer number (51010105605966).

Almost surely, 2^{102020211211931} is an apocalyptic number.

102020211211931 is a deficient number, since it is larger than the sum of its proper divisors (1).

102020211211931 is an equidigital number, since it uses as much as digits as its factorization.

102020211211931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 26.

The spelling of 102020211211931 in words is "one hundred two trillion, twenty billion, two hundred eleven million, two hundred eleven thousand, nine hundred thirty-one".