117779279421 has 4 divisors (see below), whose sum is σ = 157039039232. Its totient is φ = 78519519612.

The previous prime is 117779279413. The next prime is 117779279437. The reversal of 117779279421 is 124972977711.

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.

It is not a de Polignac number, because 117779279421 - 2³ = 117779279413 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 (117779279441) 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, 19629879901 + ... + 19629879906.

It is an arithmetic number, because the mean of its divisors is an integer number (39259759808).

Almost surely, 2^117779279421 is an apocalyptic number.

It is an amenable number.

117779279421 is a deficient number, since it is larger than the sum of its proper divisors (39259759811).

117779279421 is an equidigital number, since it uses as much as digits as its factorization.

117779279421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39259759810.

The product of its digits is 3111696, while the sum is 57.

The spelling of 117779279421 in words is "one hundred seventeen billion, seven hundred seventy-nine million, two hundred seventy-nine thousand, four hundred twenty-one".