231023221440 has 112 divisors (see below), whose sum is σ = 800180467200. Its totient is φ = 56005626880.

The previous prime is 231023221427. The next prime is 231023221441. The reversal of 231023221440 is 44122320132.

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 231023221440.

It is not an unprimeable number, because it can be changed into a prime (231023221441) 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 15 ways as a sum of consecutive naturals, for example, 10928040 + ... + 10949159.

Almost surely, 2^231023221440 is an apocalyptic number.

231023221440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231023221440 is an abundant number, since it is smaller than the sum of its proper divisors (569157245760).

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

231023221440 is a wasteful number, since it uses less digits than its factorization.

231023221440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21877230 (or 21877220 counting only the distinct ones).

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

Adding to 231023221440 its reverse (44122320132), we get a palindrome (275145541572).

The spelling of 231023221440 in words is "two hundred thirty-one billion, twenty-three million, two hundred twenty-one thousand, four hundred forty".