22215900 has 144 divisors (see below), whose sum is σ = 74995200. Its totient is φ = 4972800.

The previous prime is 22215899. The next prime is 22215911. The reversal of 22215900 is 951222.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 149026 + ... + 149174.

It is an arithmetic number, because the mean of its divisors is an integer number (520800).

Almost surely, 2^22215900 is an apocalyptic number.

22215900 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 22215900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37497600).

22215900 is an abundant number, since it is smaller than the sum of its proper divisors (52779300).

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

22215900 is a wasteful number, since it uses less digits than its factorization.

22215900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 22215900 is about 4713.3745872782. The cubic root of 22215900 is about 281.1175573947.

The spelling of 22215900 in words is "twenty-two million, two hundred fifteen thousand, nine hundred".