22099812 has 96 divisors (see below), whose sum is σ = 63329280. Its totient is φ = 5857920.

The previous prime is 22099811. The next prime is 22099837. The reversal of 22099812 is 21899022.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (22099811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97243 + ... + 97469.

It is an arithmetic number, because the mean of its divisors is an integer number (659680).

Almost surely, 2^22099812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22099812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31664640).

22099812 is an abundant number, since it is smaller than the sum of its proper divisors (41229468).

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

22099812 is a wasteful number, since it uses less digits than its factorization.

22099812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 22099812 is about 4701.0437139001. The cubic root of 22099812 is about 280.6270470897.

Subtracting from 22099812 its product of nonzero digits (5184), we obtain a triangular number (22094628 = T₆₆₄₇).

It can be divided in two parts, 2209 and 9812, that added together give a palindrome (12021).

The spelling of 22099812 in words is "twenty-two million, ninety-nine thousand, eight hundred twelve".