22021456 has 40 divisors (see below), whose sum is σ = 45398880. Its totient is φ = 10318464.

The previous prime is 22021429. The next prime is 22021457. The reversal of 22021456 is 65412022.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021457) 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, 32190 + ... + 32866.

It is an arithmetic number, because the mean of its divisors is an integer number (1134972).

Almost surely, 2^22021456 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 22021456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22699440).

22021456 is an abundant number, since it is smaller than the sum of its proper divisors (23377424).

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

22021456 is a wasteful number, since it uses less digits than its factorization.

22021456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811 (or 805 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 22021456 is about 4692.7024197151. The cubic root of 22021456 is about 280.2949952198.

Adding to 22021456 its reverse (65412022), we get a palindrome (87433478).

The spelling of 22021456 in words is "twenty-two million, twenty-one thousand, four hundred fifty-six".