102440104021 has 2 divisors, whose sum is σ = 102440104022. Its totient is φ = 102440104020.

The previous prime is 102440104001. The next prime is 102440104031. The reversal of 102440104021 is 120401044201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91751439025 + 10688664996 = 302905^2 + 103386^2 .

It is a cyclic number.

It is not a de Polignac number, because 102440104021 - 2²³ = 102431715413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102440104021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102440104001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51220052010 + 51220052011.

It is an arithmetic number, because the mean of its divisors is an integer number (51220052011).

Almost surely, 2^102440104021 is an apocalyptic number.

It is an amenable number.

102440104021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102440104021 is an equidigital number, since it uses as much as digits as its factorization.

102440104021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 102440104021 its reverse (120401044201), we get a palindrome (222841148222).

The spelling of 102440104021 in words is "one hundred two billion, four hundred forty million, one hundred four thousand, twenty-one".