21132231100 has 36 divisors (see below), whose sum is σ = 45923454808. Its totient is φ = 8440632000.

The previous prime is 21132231017. The next prime is 21132231119. The reversal of 21132231100 is 113223112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83811 + ... + 222010.

Almost surely, 2^21132231100 is an apocalyptic number.

21132231100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21132231100 is an abundant number, since it is smaller than the sum of its proper divisors (24791223708).

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

21132231100 is a wasteful number, since it uses less digits than its factorization.

21132231100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306526 (or 306519 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21132231100 its reverse (113223112), we get a palindrome (21245454212).

The spelling of 21132231100 in words is "twenty-one billion, one hundred thirty-two million, two hundred thirty-one thousand, one hundred".