231330011220 has 288 divisors, whose sum is σ = 876415438080. Its totient is φ = 47982458880.

The previous prime is 231330011219. The next prime is 231330011243. The reversal of 231330011220 is 22110033132.

231330011220 is a `hidden beast` number, since 231 + 3 + 300 + 112 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 231330011193 and 231330011202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7871674 + ... + 7901006.

It is an arithmetic number, because the mean of its divisors is an integer number (3043109160).

Almost surely, 2^231330011220 is an apocalyptic number.

231330011220 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 231330011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (438207719040).

231330011220 is an abundant number, since it is smaller than the sum of its proper divisors (645085426860).

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

231330011220 is a wasteful number, since it uses less digits than its factorization.

231330011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29935 (or 29930 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 231330011220 its reverse (22110033132), we get a palindrome (253440044352).

The spelling of 231330011220 in words is "two hundred thirty-one billion, three hundred thirty million, eleven thousand, two hundred twenty".