76913800921 has 4 divisors (see below), whose sum is σ = 76941782500. Its totient is φ = 76885819344.

The previous prime is 76913800919. The next prime is 76913800933. The reversal of 76913800921 is 12900831967.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12900831967 = 1123 ⋅11487829.

It can be written as a sum of positive squares in 2 ways, for example, as 5507272521 + 71406528400 = 74211^2 + 267220^2 .

It is a cyclic number.

It is not a de Polignac number, because 76913800921 - 2¹ = 76913800919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76913800321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13986666 + ... + 13992163.

It is an arithmetic number, because the mean of its divisors is an integer number (19235445625).

Almost surely, 2^76913800921 is an apocalyptic number.

It is an amenable number.

76913800921 is a deficient number, since it is larger than the sum of its proper divisors (27981579).

76913800921 is a wasteful number, since it uses less digits than its factorization.

76913800921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27981578.

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 76913800921 in words is "seventy-six billion, nine hundred thirteen million, eight hundred thousand, nine hundred twenty-one".