79423279921 has 8 divisors (see below), whose sum is σ = 82552627584. Its totient is φ = 76345657200.

The previous prime is 79423279891. The next prime is 79423279927. The reversal of 79423279921 is 12997232497.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79423279921 - 2¹¹ = 79423277873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79423279927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12928105 + ... + 12934246.

It is an arithmetic number, because the mean of its divisors is an integer number (10319078448).

Almost surely, 2^79423279921 is an apocalyptic number.

It is an amenable number.

79423279921 is a deficient number, since it is larger than the sum of its proper divisors (3129347663).

79423279921 is a wasteful number, since it uses less digits than its factorization.

79423279921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25862471.

The product of its digits is 3429216, while the sum is 55.

The spelling of 79423279921 in words is "seventy-nine billion, four hundred twenty-three million, two hundred seventy-nine thousand, nine hundred twenty-one".