23131222440 has 128 divisors (see below), whose sum is σ = 75565008000. Its totient is φ = 5642155008.

The previous prime is 23131222409. The next prime is 23131222447. The reversal of 23131222440 is 4422213132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 23131222440.

It is not an unprimeable number, because it can be changed into a prime (23131222447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108799 + ... + 241038.

It is an arithmetic number, because the mean of its divisors is an integer number (590351625).

Almost surely, 2^23131222440 is an apocalyptic number.

23131222440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23131222440 is an abundant number, since it is smaller than the sum of its proper divisors (52433785560).

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

23131222440 is a wasteful number, since it uses less digits than its factorization.

23131222440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349899 (or 349895 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 23131222440 its reverse (4422213132), we get a palindrome (27553435572).

The spelling of 23131222440 in words is "twenty-three billion, one hundred thirty-one million, two hundred twenty-two thousand, four hundred forty".