21792828979 has 2 divisors, whose sum is σ = 21792828980. Its totient is φ = 21792828978.

The previous prime is 21792828929. The next prime is 21792828991. The reversal of 21792828979 is 97982829712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21792828979 - 2²¹ = 21790731827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21792828979.

It is not a weakly prime, because it can be changed into another prime (21792828929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10896414489 + 10896414490.

It is an arithmetic number, because the mean of its divisors is an integer number (10896414490).

Almost surely, 2^21792828979 is an apocalyptic number.

21792828979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21792828979 is an equidigital number, since it uses as much as digits as its factorization.

21792828979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 64.

The spelling of 21792828979 in words is "twenty-one billion, seven hundred ninety-two million, eight hundred twenty-eight thousand, nine hundred seventy-nine".