23431321240 has 64 divisors (see below), whose sum is σ = 54206651520. Its totient is φ = 9110016000.

The previous prime is 23431321229. The next prime is 23431321241. The reversal of 23431321240 is 4212313432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23431321241) 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, 418080 + ... + 470800.

It is an arithmetic number, because the mean of its divisors is an integer number (846978930).

Almost surely, 2^23431321240 is an apocalyptic number.

23431321240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23431321240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27103325760).

23431321240 is an abundant number, since it is smaller than the sum of its proper divisors (30775330280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23431321240 is a wasteful number, since it uses less digits than its factorization.

23431321240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53044 (or 53040 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 23431321240 its reverse (4212313432), we get a palindrome (27643634672).

The spelling of 23431321240 in words is "twenty-three billion, four hundred thirty-one million, three hundred twenty-one thousand, two hundred forty".