231321223100220 has 192 divisors, whose sum is σ = 718059829132800. Its totient is φ = 55169046282240.

The previous prime is 231321223100207. The next prime is 231321223100221. The reversal of 231321223100220 is 22001322123132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321223100221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30603916 + ... + 37406444.

It is an arithmetic number, because the mean of its divisors is an integer number (3739894943400).

Almost surely, 2^{231321223100220} is an apocalyptic number.

231321223100220 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 231321223100220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (359029914566400).

231321223100220 is an abundant number, since it is smaller than the sum of its proper divisors (486738606032580).

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

231321223100220 is a wasteful number, since it uses less digits than its factorization.

231321223100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6803388 (or 6803386 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 231321223100220 its reverse (22001322123132), we get a palindrome (253322545223352).

The spelling of 231321223100220 in words is "two hundred thirty-one trillion, three hundred twenty-one billion, two hundred twenty-three million, one hundred thousand, two hundred twenty".