79990100021 has 8 divisors (see below), whose sum is σ = 86470728960. Its totient is φ = 73556263152.

The previous prime is 79990100011. The next prime is 79990100023. The reversal of 79990100021 is 12000109997.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79990100021 is a prime.

It is a super-2 number, since 2×79990100021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79990100023) 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, 11694461 + ... + 11701298.

It is an arithmetic number, because the mean of its divisors is an integer number (10808841120).

Almost surely, 2^79990100021 is an apocalyptic number.

It is an amenable number.

79990100021 is a deficient number, since it is larger than the sum of its proper divisors (6480628939).

79990100021 is a wasteful number, since it uses less digits than its factorization.

79990100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23396035.

The product of its (nonzero) digits is 10206, while the sum is 38.

The spelling of 79990100021 in words is "seventy-nine billion, nine hundred ninety million, one hundred thousand, twenty-one".