231333333440 has 224 divisors, whose sum is σ = 615574080000. Its totient is φ = 82096312320.

The previous prime is 231333333421. The next prime is 231333333443. The reversal of 231333333440 is 44333333132.

It is a happy number.

It is a super-2 number, since 2×231333333440² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 231333333397 and 231333333406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231333333443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25702061 + ... + 25711059.

Almost surely, 2^231333333440 is an apocalyptic number.

231333333440 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 231333333440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307787040000).

231333333440 is an abundant number, since it is smaller than the sum of its proper divisors (384240746560).

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

231333333440 is a wasteful number, since it uses less digits than its factorization.

231333333440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9203 (or 9193 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 32.

Adding to 231333333440 its reverse (44333333132), we get a palindrome (275666666572).

The spelling of 231333333440 in words is "two hundred thirty-one billion, three hundred thirty-three million, three hundred thirty-three thousand, four hundred forty".