231204421433440 has 768 divisors, whose sum is σ = 760039656026112. Its totient is φ = 64341845213184.

The previous prime is 231204421433399. The next prime is 231204421433441. The reversal of 231204421433440 is 44334124402132.

It is a self number, because there is not a number n which added to its sum of digits gives 231204421433440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231204421433441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 244325044 + ... + 245269516.

It is an arithmetic number, because the mean of its divisors is an integer number (989634968784).

Almost surely, 2^{231204421433440} is an apocalyptic number.

231204421433440 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 231204421433440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (380019828013056).

231204421433440 is an abundant number, since it is smaller than the sum of its proper divisors (528835234592672).

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

231204421433440 is a wasteful number, since it uses less digits than its factorization.

231204421433440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944591 (or 944583 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 37.

Adding to 231204421433440 its reverse (44334124402132), we get a palindrome (275538545835572).

The spelling of 231204421433440 in words is "two hundred thirty-one trillion, two hundred four billion, four hundred twenty-one million, four hundred thirty-three thousand, four hundred forty".