102782738921 has 2 divisors, whose sum is σ = 102782738922. Its totient is φ = 102782738920.

The previous prime is 102782738887. The next prime is 102782738959. The reversal of 102782738921 is 129837287201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100663425625 + 2119313296 = 317275^2 + 46036^2 .

It is a cyclic number.

It is not a de Polignac number, because 102782738921 - 2³⁰ = 101708997097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102782738921.

It is not a weakly prime, because it can be changed into another prime (102782738321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51391369460 + 51391369461.

It is an arithmetic number, because the mean of its divisors is an integer number (51391369461).

Almost surely, 2^102782738921 is an apocalyptic number.

It is an amenable number.

102782738921 is a deficient number, since it is larger than the sum of its proper divisors (1).

102782738921 is an equidigital number, since it uses as much as digits as its factorization.

102782738921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 102782738921 in words is "one hundred two billion, seven hundred eighty-two million, seven hundred thirty-eight thousand, nine hundred twenty-one".