21424800664223 has 4 divisors (see below), whose sum is σ = 23372509815528. Its totient is φ = 19477091512920.

The previous prime is 21424800664193. The next prime is 21424800664243. The reversal of 21424800664223 is 32246600842412.

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 21424800664223 - 2²⁶ = 21424733555359 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 (21424800664243) 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 in 3 ways as a sum of consecutive naturals, for example, 973854575636 + ... + 973854575657.

It is an arithmetic number, because the mean of its divisors is an integer number (5843127453882).

Almost surely, 2^{21424800664223} is an apocalyptic number.

21424800664223 is a deficient number, since it is larger than the sum of its proper divisors (1947709151305).

21424800664223 is a wasteful number, since it uses less digits than its factorization.

21424800664223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947709151304.

The product of its (nonzero) digits is 884736, while the sum is 44.

The spelling of 21424800664223 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred million, six hundred sixty-four thousand, two hundred twenty-three".