79942404221 has 8 divisors (see below), whose sum is σ = 84227052000. Its totient is φ = 75665471760.

The previous prime is 79942404187. The next prime is 79942404257. The reversal of 79942404221 is 12240424997.

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-79942404221 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 (79942401221) 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, 1907546 + ... + 1949003.

It is an arithmetic number, because the mean of its divisors is an integer number (10528381500).

Almost surely, 2^79942404221 is an apocalyptic number.

It is an amenable number.

79942404221 is a deficient number, since it is larger than the sum of its proper divisors (4284647779).

79942404221 is a wasteful number, since it uses less digits than its factorization.

79942404221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3857659.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 79942404221 in words is "seventy-nine billion, nine hundred forty-two million, four hundred four thousand, two hundred twenty-one".