22021443 has 16 divisors (see below), whose sum is σ = 34544160. Its totient is φ = 13817088.

The previous prime is 22021429. The next prime is 22021457. The reversal of 22021443 is 34412022.

22021443 is a `hidden beast` number, since 220 + 2 + 1 + 443 = 666.

It is an interprime number because it is at equal distance from previous prime (22021429) and next prime (22021457).

It is not a de Polignac number, because 22021443 - 2⁹ = 22020931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22021403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23530 + ... + 24447.

It is an arithmetic number, because the mean of its divisors is an integer number (2159010).

Almost surely, 2^22021443 is an apocalyptic number.

22021443 is a deficient number, since it is larger than the sum of its proper divisors (12522717).

22021443 is a wasteful number, since it uses less digits than its factorization.

22021443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48003 (or 47997 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 22021443 is about 4692.7010345855. The cubic root of 22021443 is about 280.2949400640.

Adding to 22021443 its reverse (34412022), we get a palindrome (56433465).

The spelling of 22021443 in words is "twenty-two million, twenty-one thousand, four hundred forty-three".