102104400055021 has 12 divisors (see below), whose sum is σ = 127911006663132. Its totient is φ = 80785898944128.

The previous prime is 102104400055001. The next prime is 102104400055069. The reversal of 102104400055021 is 120550004401201.

It can be written as a sum of positive squares in 2 ways, for example, as 26907510690025 + 75196889364996 = 5187245^2 + 8671614^2 .

It is not a de Polignac number, because 102104400055021 - 2³⁷ = 101966961101549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102104400055001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80144740380 + ... + 80144741653.

It is an arithmetic number, because the mean of its divisors is an integer number (10659250555261).

Almost surely, 2^{102104400055021} is an apocalyptic number.

It is an amenable number.

102104400055021 is a deficient number, since it is larger than the sum of its proper divisors (25806606608111).

102104400055021 is a wasteful number, since it uses less digits than its factorization.

102104400055021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160289482060 (or 160289482053 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 102104400055021 its reverse (120550004401201), we get a palindrome (222654404456222).

The spelling of 102104400055021 in words is "one hundred two trillion, one hundred four billion, four hundred million, fifty-five thousand, twenty-one".