23440221431 has 4 divisors (see below), whose sum is σ = 25571150664. Its totient is φ = 21309292200.

The previous prime is 23440221419. The next prime is 23440221439. The reversal of 23440221431 is 13412204432.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23440221431 is a prime.

It is a super-2 number, since 2×23440221431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23440221431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23440221439) 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, 1065464600 + ... + 1065464621.

It is an arithmetic number, because the mean of its divisors is an integer number (6392787666).

Almost surely, 2^23440221431 is an apocalyptic number.

23440221431 is a deficient number, since it is larger than the sum of its proper divisors (2130929233).

23440221431 is a wasteful number, since it uses less digits than its factorization.

23440221431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130929232.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 23440221431 its reverse (13412204432), we get a palindrome (36852425863).

The spelling of 23440221431 in words is "twenty-three billion, four hundred forty million, two hundred twenty-one thousand, four hundred thirty-one".