21633433579 has 2 divisors, whose sum is σ = 21633433580. Its totient is φ = 21633433578.

The previous prime is 21633433571. The next prime is 21633433621. The reversal of 21633433579 is 97533433612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21633433579 - 2³ = 21633433571 is a prime.

It is not a weakly prime, because it can be changed into another prime (21633433571) 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, 10816716789 + 10816716790.

It is an arithmetic number, because the mean of its divisors is an integer number (10816716790).

Almost surely, 2^21633433579 is an apocalyptic number.

21633433579 is a deficient number, since it is larger than the sum of its proper divisors (1).

21633433579 is an equidigital number, since it uses as much as digits as its factorization.

21633433579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 46.

The spelling of 21633433579 in words is "twenty-one billion, six hundred thirty-three million, four hundred thirty-three thousand, five hundred seventy-nine".