21122119979 has 4 divisors (see below), whose sum is σ = 21803478720. Its totient is φ = 20440761240.

The previous prime is 21122119933. The next prime is 21122119987. The reversal of 21122119979 is 97991122112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21122119979 - 2⁸ = 21122119723 is a prime.

It is a super-2 number, since 2×21122119979² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122179979) 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, 340679324 + ... + 340679385.

It is an arithmetic number, because the mean of its divisors is an integer number (5450869680).

Almost surely, 2^21122119979 is an apocalyptic number.

21122119979 is a deficient number, since it is larger than the sum of its proper divisors (681358741).

21122119979 is an equidigital number, since it uses as much as digits as its factorization.

21122119979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681358740.

The product of its digits is 40824, while the sum is 44.

The spelling of 21122119979 in words is "twenty-one billion, one hundred twenty-two million, one hundred nineteen thousand, nine hundred seventy-nine".