79995021 has 16 divisors (see below), whose sum is σ = 111034560. Its totient is φ = 51166080.

The previous prime is 79995001. The next prime is 79995023. The reversal of 79995021 is 12059997.

It is not a de Polignac number, because 79995021 - 2²² = 75800717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79995023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11361 + ... + 17001.

It is an arithmetic number, because the mean of its divisors is an integer number (6939660).

Almost surely, 2^79995021 is an apocalyptic number.

It is an amenable number.

79995021 is a deficient number, since it is larger than the sum of its proper divisors (31039539).

79995021 is a wasteful number, since it uses less digits than its factorization.

79995021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5836.

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 79995021 is about 8943.9935711068. The cubic root of 79995021 is about 430.8779987123.

The spelling of 79995021 in words is "seventy-nine million, nine hundred ninety-five thousand, twenty-one".