79365021 has 4 divisors (see below), whose sum is σ = 105820032. Its totient is φ = 52910012.

The previous prime is 79365017. The next prime is 79365029. The reversal of 79365021 is 12056397.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12056397 = 3 ⋅4018799.

It is a cyclic number.

It is not a de Polignac number, because 79365021 - 2² = 79365017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79365029) 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, 13227501 + ... + 13227506.

It is an arithmetic number, because the mean of its divisors is an integer number (26455008).

Almost surely, 2^79365021 is an apocalyptic number.

It is an amenable number.

79365021 is a deficient number, since it is larger than the sum of its proper divisors (26455011).

79365021 is a wasteful number, since it uses less digits than its factorization.

79365021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26455010.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 79365021 is about 8908.7047880149. The cubic root of 79365021 is about 429.7438911185.

The spelling of 79365021 in words is "seventy-nine million, three hundred sixty-five thousand, twenty-one".