22121204 has 12 divisors (see below), whose sum is σ = 44242464. Its totient is φ = 9480504.

The previous prime is 22121201. The next prime is 22121213. The reversal of 22121204 is 40212122.

22121204 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394994 + ... + 395049.

It is an arithmetic number, because the mean of its divisors is an integer number (3686872).

Almost surely, 2^22121204 is an apocalyptic number.

It is an amenable number.

22121204 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

22121204 is a wasteful number, since it uses less digits than its factorization.

22121204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790054 (or 790052 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 22121204 is about 4703.3184030002. The cubic root of 22121204 is about 280.7175642679.

Adding to 22121204 its reverse (40212122), we get a palindrome (62333326).

The spelling of 22121204 in words is "twenty-two million, one hundred twenty-one thousand, two hundred four".