231532421540440 has 64 divisors (see below), whose sum is σ = 535737689724960. Its totient is φ = 90016343239680.

The previous prime is 231532421540429. The next prime is 231532421540461. The reversal of 231532421540440 is 44045124235132.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 231532421540393 and 231532421540402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510116181 + ... + 510569860.

Almost surely, 2^{231532421540440} is an apocalyptic number.

231532421540440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231532421540440 is an abundant number, since it is smaller than the sum of its proper divisors (304205268184520).

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

231532421540440 is a wasteful number, since it uses less digits than its factorization.

231532421540440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020686212 (or 1020686208 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 40.

Adding to 231532421540440 its reverse (44045124235132), we get a palindrome (275577545775572).

The spelling of 231532421540440 in words is "two hundred thirty-one trillion, five hundred thirty-two billion, four hundred twenty-one million, five hundred forty thousand, four hundred forty".