231021100 has 18 divisors (see below), whose sum is σ = 501316004. Its totient is φ = 92408400.

The previous prime is 231021061. The next prime is 231021103. The reversal of 231021100 is 1120132.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (231021103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1155006 + ... + 1155205.

Almost surely, 2^231021100 is an apocalyptic number.

231021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231021100 is an abundant number, since it is smaller than the sum of its proper divisors (270294904).

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

231021100 is a wasteful number, since it uses less digits than its factorization.

231021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310225 (or 2310218 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 231021100 is about 15199.3782767586. The cubic root of 231021100 is about 613.5979252474.

Adding to 231021100 its reverse (1120132), we get a palindrome (232141232).

The spelling of 231021100 in words is "two hundred thirty-one million, twenty-one thousand, one hundred".