231120421440 has 112 divisors (see below), whose sum is σ = 735126466752. Its totient is φ = 61521319936.

The previous prime is 231120421439. The next prime is 231120421459. The reversal of 231120421440 is 44124021132.

231120421440 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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 231120421440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318607 + ... + 750833.

Almost surely, 2^231120421440 is an apocalyptic number.

231120421440 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 231120421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (367563233376).

231120421440 is an abundant number, since it is smaller than the sum of its proper divisors (504006045312).

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

231120421440 is a wasteful number, since it uses less digits than its factorization.

231120421440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432804 (or 432794 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 231120421440 its reverse (44124021132), we get a palindrome (275244442572).

The spelling of 231120421440 in words is "two hundred thirty-one billion, one hundred twenty million, four hundred twenty-one thousand, four hundred forty".