23440423021 has 32 divisors (see below), whose sum is σ = 26834976000. Its totient is φ = 20341601280.

The previous prime is 23440423007. The next prime is 23440423033. The reversal of 23440423021 is 12032404432.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 23440423021 - 2¹⁷ = 23440291949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23440423001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9194655 + ... + 9197203.

It is an arithmetic number, because the mean of its divisors is an integer number (838593000).

Almost surely, 2^23440423021 is an apocalyptic number.

It is an amenable number.

23440423021 is a deficient number, since it is larger than the sum of its proper divisors (3394552979).

23440423021 is a wasteful number, since it uses less digits than its factorization.

23440423021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3429.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 23440423021 its reverse (12032404432), we get a palindrome (35472827453).

The spelling of 23440423021 in words is "twenty-three billion, four hundred forty million, four hundred twenty-three thousand, twenty-one".