79401260021 has 8 divisors (see below), whose sum is σ = 81260807040. Its totient is φ = 77563210912.

The previous prime is 79401259961. The next prime is 79401260023. The reversal of 79401260021 is 12006210497.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 79401260021 - 2¹⁰ = 79401258997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79401260021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79401260023) 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, 5367005 + ... + 5381778.

It is an arithmetic number, because the mean of its divisors is an integer number (10157600880).

Almost surely, 2^79401260021 is an apocalyptic number.

It is an amenable number.

79401260021 is a deficient number, since it is larger than the sum of its proper divisors (1859547019).

79401260021 is a wasteful number, since it uses less digits than its factorization.

79401260021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10748955.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 79401260021 in words is "seventy-nine billion, four hundred one million, two hundred sixty thousand, twenty-one".