102637018021 has 2 divisors, whose sum is σ = 102637018022. Its totient is φ = 102637018020.

The previous prime is 102637017979. The next prime is 102637018037. The reversal of 102637018021 is 120810736201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57414868996 + 45222149025 = 239614^2 + 212655^2 .

It is an emirp because it is prime and its reverse (120810736201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102637018021 - 2⁷ = 102637017893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102637018091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51318509010 + 51318509011.

It is an arithmetic number, because the mean of its divisors is an integer number (51318509011).

Almost surely, 2^102637018021 is an apocalyptic number.

It is an amenable number.

102637018021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102637018021 is an equidigital number, since it uses as much as digits as its factorization.

102637018021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The spelling of 102637018021 in words is "one hundred two billion, six hundred thirty-seven million, eighteen thousand, twenty-one".