231320222540 has 96 divisors (see below), whose sum is σ = 553482768384. Its totient is φ = 80385212160.

The previous prime is 231320222531. The next prime is 231320222543. The reversal of 231320222540 is 45222023132.

231320222540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (231320222543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5631557 + ... + 5672483.

It is an arithmetic number, because the mean of its divisors is an integer number (5765445504).

Almost surely, 2^231320222540 is an apocalyptic number.

231320222540 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 231320222540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276741384192).

231320222540 is an abundant number, since it is smaller than the sum of its proper divisors (322162545844).

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

231320222540 is a wasteful number, since it uses less digits than its factorization.

231320222540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42087 (or 42085 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 231320222540 its reverse (45222023132), we get a palindrome (276542245672).

The spelling of 231320222540 in words is "two hundred thirty-one billion, three hundred twenty million, two hundred twenty-two thousand, five hundred forty".