22055021 has 2 divisors, whose sum is σ = 22055022. Its totient is φ = 22055020.

The previous prime is 22055003. The next prime is 22055023. The reversal of 22055021 is 12055022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16362025 + 5692996 = 4045^2 + 2386^2 .

It is a cyclic number.

It is not a de Polignac number, because 22055021 - 2⁶ = 22054957 is a prime.

It is a Sophie Germain prime.

Together with 22055023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22055023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11027510 + 11027511.

It is an arithmetic number, because the mean of its divisors is an integer number (11027511).

Almost surely, 2^22055021 is an apocalyptic number.

It is an amenable number.

22055021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22055021 is an equidigital number, since it uses as much as digits as its factorization.

22055021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 22055021 is about 4696.2773555232. The cubic root of 22055021 is about 280.4373310343.

Subtracting from 22055021 its reverse (12055022), we obtain a palindrome (9999999).

The spelling of 22055021 in words is "twenty-two million, fifty-five thousand, twenty-one".