22021228 has 24 divisors (see below), whose sum is σ = 41065920. Its totient is φ = 10302480.

The previous prime is 22021211. The next prime is 22021229. The reversal of 22021228 is 82212022.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (22021229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4563 + ... + 8053.

It is an arithmetic number, because the mean of its divisors is an integer number (1711080).

Almost surely, 2^22021228 is an apocalyptic number.

It is an amenable number.

22021228 is a deficient number, since it is larger than the sum of its proper divisors (19044692).

22021228 is a wasteful number, since it uses less digits than its factorization.

22021228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3597 (or 3595 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 22021228 is about 4692.6781266138. The cubic root of 22021228 is about 280.2940278681.

The spelling of 22021228 in words is "twenty-two million, twenty-one thousand, two hundred twenty-eight".