102812506021 has 2 divisors, whose sum is σ = 102812506022. Its totient is φ = 102812506020.

The previous prime is 102812506001. The next prime is 102812506039. The reversal of 102812506021 is 120605218201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99644392225 + 3168113796 = 315665^2 + 56286^2 .

It is a cyclic number.

It is not a de Polignac number, because 102812506021 - 2⁷ = 102812505893 is a prime.

It is a super-2 number, since 2×102812506021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102812506001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51406253010 + 51406253011.

It is an arithmetic number, because the mean of its divisors is an integer number (51406253011).

Almost surely, 2^102812506021 is an apocalyptic number.

It is an amenable number.

102812506021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102812506021 is an equidigital number, since it uses as much as digits as its factorization.

102812506021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 28.

The spelling of 102812506021 in words is "one hundred two billion, eight hundred twelve million, five hundred six thousand, twenty-one".