21022669979 has 2 divisors, whose sum is σ = 21022669980. Its totient is φ = 21022669978.

The previous prime is 21022669963. The next prime is 21022670021. The reversal of 21022669979 is 97996622012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21022669979 - 2⁴ = 21022669963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21022669979.

It is not a weakly prime, because it can be changed into another prime (21022669379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511334989 + 10511334990.

It is an arithmetic number, because the mean of its divisors is an integer number (10511334990).

Almost surely, 2^21022669979 is an apocalyptic number.

21022669979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022669979 is an equidigital number, since it uses as much as digits as its factorization.

21022669979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 53.

The spelling of 21022669979 in words is "twenty-one billion, twenty-two million, six hundred sixty-nine thousand, nine hundred seventy-nine".