22025021 has 2 divisors, whose sum is σ = 22025022. Its totient is φ = 22025020.

The previous prime is 22024997. The next prime is 22025023. The reversal of 22025021 is 12052022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 1999396 = 4475^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 22025021 - 2¹⁸ = 21762877 is a prime.

Together with 22025023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22024987 and 22025005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22025023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11012510 + 11012511.

It is an arithmetic number, because the mean of its divisors is an integer number (11012511).

Almost surely, 2^22025021 is an apocalyptic number.

It is an amenable number.

22025021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22025021 is an equidigital number, since it uses as much as digits as its factorization.

22025021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 22025021 is about 4693.0822494391. The cubic root of 22025021 is about 280.3101198289.

Adding to 22025021 its reverse (12052022), we get a palindrome (34077043).

The spelling of 22025021 in words is "twenty-two million, twenty-five thousand, twenty-one".