231212100 has 144 divisors (see below), whose sum is σ = 797948928. Its totient is φ = 50540160.

The previous prime is 231212071. The next prime is 231212141. The reversal of 231212100 is 1212132.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45907 + ... + 50693.

It is an arithmetic number, because the mean of its divisors is an integer number (5541312).

Almost surely, 2^231212100 is an apocalyptic number.

231212100 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 231212100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398974464).

231212100 is an abundant number, since it is smaller than the sum of its proper divisors (566736828).

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

231212100 is a wasteful number, since it uses less digits than its factorization.

231212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4834 (or 4827 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 231212100 is about 15205.6601303594. The cubic root of 231212100 is about 613.7669789549.

Adding to 231212100 its reverse (1212132), we get a palindrome (232424232).

The spelling of 231212100 in words is "two hundred thirty-one million, two hundred twelve thousand, one hundred".