22207021 has 2 divisors, whose sum is σ = 22207022. Its totient is φ = 22207020.

The previous prime is 22207019. The next prime is 22207027. The reversal of 22207021 is 12070222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19448100 + 2758921 = 4410^2 + 1661^2 .

It is a cyclic number.

It is not a de Polignac number, because 22207021 - 2¹ = 22207019 is a prime.

Together with 22207019, it forms a pair of twin primes.

It is equal to p_1401424 and since 22207021 and 1401424 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 22206986 and 22207004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22207027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11103510 + 11103511.

It is an arithmetic number, because the mean of its divisors is an integer number (11103511).

Almost surely, 2^22207021 is an apocalyptic number.

It is an amenable number.

22207021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22207021 is an equidigital number, since it uses as much as digits as its factorization.

22207021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 22207021 is about 4712.4325989875. The cubic root of 22207021 is about 281.0801011075.

Adding to 22207021 its reverse (12070222), we get a palindrome (34277243).

The spelling of 22207021 in words is "twenty-two million, two hundred seven thousand, twenty-one".