102020209931 has 2 divisors, whose sum is σ = 102020209932. Its totient is φ = 102020209930.

The previous prime is 102020209891. The next prime is 102020209943. The reversal of 102020209931 is 139902020201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102020209931 - 2⁶ = 102020209867 is a prime.

It is a super-2 number, since 2×102020209931² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 102020209894 and 102020209903.

It is not a weakly prime, because it can be changed into another prime (102020209231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010104965 + 51010104966.

It is an arithmetic number, because the mean of its divisors is an integer number (51010104966).

Almost surely, 2^102020209931 is an apocalyptic number.

102020209931 is a deficient number, since it is larger than the sum of its proper divisors (1).

102020209931 is an equidigital number, since it uses as much as digits as its factorization.

102020209931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The spelling of 102020209931 in words is "one hundred two billion, twenty million, two hundred nine thousand, nine hundred thirty-one".