22131900 has 144 divisors (see below), whose sum is σ = 81383680. Its totient is φ = 5054400.

The previous prime is 22131887. The next prime is 22131913. The reversal of 22131900 is 913122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22131887) and next prime (22131913).

It is a super-2 number, since 2×22131900² = 979641995220000, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 18315 + ... + 19485.

Almost surely, 2^22131900 is an apocalyptic number.

22131900 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 22131900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40691840).

22131900 is an abundant number, since it is smaller than the sum of its proper divisors (59251780).

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

22131900 is a wasteful number, since it uses less digits than its factorization.

22131900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201 (or 1188 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 22131900 is about 4704.4553351052. The cubic root of 22131900 is about 280.7628009748.

The spelling of 22131900 in words is "twenty-two million, one hundred thirty-one thousand, nine hundred".