79007021 has 4 divisors (see below), whose sum is σ = 79040544. Its totient is φ = 78973500.

The previous prime is 79007011. The next prime is 79007029. The reversal of 79007021 is 12070097.

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: 12070097 = 13 ⋅928469.

It is a cyclic number.

It is not a de Polignac number, because 79007021 - 2¹⁸ = 78744877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79007029) 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, 12935 + ... + 18036.

It is an arithmetic number, because the mean of its divisors is an integer number (19760136).

Almost surely, 2^79007021 is an apocalyptic number.

It is an amenable number.

79007021 is a deficient number, since it is larger than the sum of its proper divisors (33523).

79007021 is a wasteful number, since it uses less digits than its factorization.

79007021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33522.

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 79007021 is about 8888.5893706482. The cubic root of 79007021 is about 429.0967537145.

The spelling of 79007021 in words is "seventy-nine million, seven thousand, twenty-one".