231312212100 has 216 divisors, whose sum is σ = 757014672960. Its totient is φ = 58965815040.

The previous prime is 231312212093. The next prime is 231312212129. The reversal of 231312212100 is 1212213132.

231312212100 is a `hidden beast` number, since 231 + 3 + 1 + 221 + 210 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 61208011 + ... + 61211789.

It is an arithmetic number, because the mean of its divisors is an integer number (3504697560).

Almost surely, 2^231312212100 is an apocalyptic number.

231312212100 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 231312212100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (378507336480).

231312212100 is an abundant number, since it is smaller than the sum of its proper divisors (525702460860).

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

231312212100 is a wasteful number, since it uses less digits than its factorization.

231312212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6779 (or 6769 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 231312212100 its reverse (1212213132), we get a palindrome (232524425232).

The spelling of 231312212100 in words is "two hundred thirty-one billion, three hundred twelve million, two hundred twelve thousand, one hundred".