22021656 has 32 divisors (see below), whose sum is σ = 56832000. Its totient is φ = 7103520.

The previous prime is 22021651. The next prime is 22021667. The reversal of 22021656 is 65612022.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14056 + ... + 15543.

It is an arithmetic number, because the mean of its divisors is an integer number (1776000).

Almost surely, 2^22021656 is an apocalyptic number.

It is an amenable number.

22021656 is an abundant number, since it is smaller than the sum of its proper divisors (34810344).

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

22021656 is a wasteful number, since it uses less digits than its factorization.

22021656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29639 (or 29635 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 22021656 is about 4692.7237293495. The cubic root of 22021656 is about 280.2958437684.

Adding to 22021656 its reverse (65612022), we get a palindrome (87633678).

The spelling of 22021656 in words is "twenty-two million, twenty-one thousand, six hundred fifty-six".