231321233220 has 192 divisors, whose sum is σ = 816596121600. Its totient is φ = 47526589440.

The previous prime is 231321233197. The next prime is 231321233233. The reversal of 231321233220 is 22332123132.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 129891 + ... + 692469.

It is an arithmetic number, because the mean of its divisors is an integer number (4253104800).

Almost surely, 2^231321233220 is an apocalyptic number.

231321233220 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 231321233220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (408298060800).

231321233220 is an abundant number, since it is smaller than the sum of its proper divisors (585274888380).

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

231321233220 is a wasteful number, since it uses less digits than its factorization.

231321233220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562698 (or 562696 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 231321233220 its reverse (22332123132), we get a palindrome (253653356352).

It can be divided in two parts, 2313212 and 33220, that added together give a palindrome (2346432).

The spelling of 231321233220 in words is "two hundred thirty-one billion, three hundred twenty-one million, two hundred thirty-three thousand, two hundred twenty".