21130222979 has 2 divisors, whose sum is σ = 21130222980. Its totient is φ = 21130222978.

The previous prime is 21130222969. The next prime is 21130222987. The reversal of 21130222979 is 97922203112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21130222979 is a prime.

It is not a weakly prime, because it can be changed into another prime (21130222969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565111489 + 10565111490.

It is an arithmetic number, because the mean of its divisors is an integer number (10565111490).

Almost surely, 2^21130222979 is an apocalyptic number.

21130222979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130222979 is an equidigital number, since it uses as much as digits as its factorization.

21130222979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The spelling of 21130222979 in words is "twenty-one billion, one hundred thirty million, two hundred twenty-two thousand, nine hundred seventy-nine".