231320222440 has 16 divisors (see below), whose sum is σ = 520470500580. Its totient is φ = 92528088960.

The previous prime is 231320222407. The next prime is 231320222443. The reversal of 231320222440 is 44222023132.

231320222440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 195447104836 + 35873117604 = 442094^2 + 189402^2 .

It is not an unprimeable number, because it can be changed into a prime (231320222443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2891502741 + ... + 2891502820.

Almost surely, 2^231320222440 is an apocalyptic number.

231320222440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231320222440 is an abundant number, since it is smaller than the sum of its proper divisors (289150278140).

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

231320222440 is a wasteful number, since it uses less digits than its factorization.

231320222440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5783005572 (or 5783005568 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 231320222440 its reverse (44222023132), we get a palindrome (275542245572).

The spelling of 231320222440 in words is "two hundred thirty-one billion, three hundred twenty million, two hundred twenty-two thousand, four hundred forty".