22022261 has 2 divisors, whose sum is σ = 22022262. Its totient is φ = 22022260.

The previous prime is 22022257. The next prime is 22022263. The reversal of 22022261 is 16222022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17901361 + 4120900 = 4231^2 + 2030^2 .

It is a cyclic number.

It is not a de Polignac number, because 22022261 - 2² = 22022257 is a prime.

It is a Sophie Germain prime.

Together with 22022263, 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 (22022263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11011130 + 11011131.

It is an arithmetic number, because the mean of its divisors is an integer number (11011131).

Almost surely, 2^22022261 is an apocalyptic number.

It is an amenable number.

22022261 is a deficient number, since it is larger than the sum of its proper divisors (1).

22022261 is an equidigital number, since it uses as much as digits as its factorization.

22022261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 22022261 is about 4692.7881904045. The cubic root of 22022261 is about 280.2984105968.

Adding to 22022261 its reverse (16222022), we get a palindrome (38244283).

The spelling of 22022261 in words is "twenty-two million, twenty-two thousand, two hundred sixty-one".