22202021 has 2 divisors, whose sum is σ = 22202022. Its totient is φ = 22202020.

The previous prime is 22201999. The next prime is 22202027. The reversal of 22202021 is 12020222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17850625 + 4351396 = 4225^2 + 2086^2 .

It is a cyclic number.

It is not a de Polignac number, because 22202021 - 2⁶ = 22201957 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22201993 and 22202011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22202027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11101010 + 11101011.

It is an arithmetic number, because the mean of its divisors is an integer number (11101011).

Almost surely, 2^22202021 is an apocalyptic number.

It is an amenable number.

22202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22202021 is an equidigital number, since it uses as much as digits as its factorization.

22202021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 22202021 is about 4711.9020575560. The cubic root of 22202021 is about 281.0590040860.

Adding to 22202021 its reverse (12020222), we get a palindrome (34222243).

The spelling of 22202021 in words is "twenty-two million, two hundred two thousand, twenty-one".