23440420221 has 16 divisors (see below), whose sum is σ = 31474126848. Its totient is φ = 15516918000.

The previous prime is 23440420207. The next prime is 23440420291. The reversal of 23440420221 is 12202404432.

It is not a de Polignac number, because 23440420221 - 2⁷ = 23440420093 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23440420191 and 23440420200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23440420291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1218540 + ... + 1237626.

It is an arithmetic number, because the mean of its divisors is an integer number (1967132928).

Almost surely, 2^23440420221 is an apocalyptic number.

It is an amenable number.

23440420221 is a deficient number, since it is larger than the sum of its proper divisors (8033706627).

23440420221 is a wasteful number, since it uses less digits than its factorization.

23440420221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21952.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 23440420221 its reverse (12202404432), we get a palindrome (35642824653).

The spelling of 23440420221 in words is "twenty-three billion, four hundred forty million, four hundred twenty thousand, two hundred twenty-one".