79107921 has 24 divisors (see below), whose sum is σ = 119062944. Its totient is φ = 52488000.

The previous prime is 79107907. The next prime is 79107923. The reversal of 79107921 is 12970197.

It is not a de Polignac number, because 79107921 - 2¹⁰ = 79106897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79107923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60345 + ... + 61641.

It is an arithmetic number, because the mean of its divisors is an integer number (4960956).

Almost surely, 2^79107921 is an apocalyptic number.

It is an amenable number.

79107921 is a deficient number, since it is larger than the sum of its proper divisors (39955023).

79107921 is a wasteful number, since it uses less digits than its factorization.

79107921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563 (or 1551 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 36.

The square root of 79107921 is about 8894.2633759070. The cubic root of 79107921 is about 429.2793427380.

The spelling of 79107921 in words is "seventy-nine million, one hundred seven thousand, nine hundred twenty-one".