22131100 has 18 divisors (see below), whose sum is σ = 48024704. Its totient is φ = 8852400.

The previous prime is 22131097. The next prime is 22131101. The reversal of 22131100 is 113122.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110556 + ... + 110755.

Almost surely, 2^22131100 is an apocalyptic number.

22131100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22131100 is an abundant number, since it is smaller than the sum of its proper divisors (25893604).

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

22131100 is a wasteful number, since it uses less digits than its factorization.

22131100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221325 (or 221318 counting only the distinct ones).

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

The square root of 22131100 is about 4704.3703085535. The cubic root of 22131100 is about 280.7594180306.

Adding to 22131100 its reverse (113122), we get a palindrome (22244222).

The spelling of 22131100 in words is "twenty-two million, one hundred thirty-one thousand, one hundred".