21722434663 has 4 divisors (see below), whose sum is σ = 22666888368. Its totient is φ = 20777980960.

The previous prime is 21722434651. The next prime is 21722434693. The reversal of 21722434663 is 36643422712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21722434663 - 2¹⁷ = 21722303591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21722434693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472226818 + ... + 472226863.

It is an arithmetic number, because the mean of its divisors is an integer number (5666722092).

Almost surely, 2^21722434663 is an apocalyptic number.

21722434663 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21722434663 is a deficient number, since it is larger than the sum of its proper divisors (944453705).

21722434663 is an equidigital number, since it uses as much as digits as its factorization.

21722434663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944453704.

The product of its digits is 290304, while the sum is 40.

The spelling of 21722434663 in words is "twenty-one billion, seven hundred twenty-two million, four hundred thirty-four thousand, six hundred sixty-three".