231231213320220 has 192 divisors, whose sum is σ = 761973108825600. Its totient is φ = 58013907194880.

The previous prime is 231231213320201. The next prime is 231231213320231. The reversal of 231231213320220 is 22023312132132.

231231213320220 is a `hidden beast` number, since 2 + 3 + 1 + 2 + 312 + 1 + 3 + 320 + 2 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21410775 + ... + 30346065.

It is an arithmetic number, because the mean of its divisors is an integer number (3968609941800).

Almost surely, 2^{231231213320220} is an apocalyptic number.

231231213320220 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 231231213320220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (380986554412800).

231231213320220 is an abundant number, since it is smaller than the sum of its proper divisors (530741895505380).

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

231231213320220 is a wasteful number, since it uses less digits than its factorization.

231231213320220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8938145 (or 8938137 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 231231213320220 its reverse (22023312132132), we get a palindrome (253254525452352).

The spelling of 231231213320220 in words is "two hundred thirty-one trillion, two hundred thirty-one billion, two hundred thirteen million, three hundred twenty thousand, two hundred twenty".