23444543021 has 4 divisors (see below), whose sum is σ = 23444869500. Its totient is φ = 23444216544.

The previous prime is 23444542997. The next prime is 23444543047. The reversal of 23444543021 is 12034544432.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 17368340521 + 6076202500 = 131789^2 + 77950^2 .

It is a cyclic number.

It is not a de Polignac number, because 23444543021 - 2¹⁸ = 23444280877 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 (23444543081) 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, 3266 + ... + 216563.

It is an arithmetic number, because the mean of its divisors is an integer number (5861217375).

Almost surely, 2^23444543021 is an apocalyptic number.

It is an amenable number.

23444543021 is a deficient number, since it is larger than the sum of its proper divisors (326479).

23444543021 is a wasteful number, since it uses less digits than its factorization.

23444543021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326478.

The product of its (nonzero) digits is 46080, while the sum is 32.

The spelling of 23444543021 in words is "twenty-three billion, four hundred forty-four million, five hundred forty-three thousand, twenty-one".