21333996979 has 2 divisors, whose sum is σ = 21333996980. Its totient is φ = 21333996978.

The previous prime is 21333996947. The next prime is 21333996989. The reversal of 21333996979 is 97969933312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21333996979 - 2⁵ = 21333996947 is a prime.

It is a super-2 number, since 2×21333996979² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21333996989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666998489 + 10666998490.

It is an arithmetic number, because the mean of its divisors is an integer number (10666998490).

Almost surely, 2^21333996979 is an apocalyptic number.

21333996979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333996979 is an equidigital number, since it uses as much as digits as its factorization.

21333996979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14880348, while the sum is 61.

The spelling of 21333996979 in words is "twenty-one billion, three hundred thirty-three million, nine hundred ninety-six thousand, nine hundred seventy-nine".