22263221 has 2 divisors, whose sum is σ = 22263222. Its totient is φ = 22263220.

The previous prime is 22263203. The next prime is 22263223. The reversal of 22263221 is 12236222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21022225 + 1240996 = 4585^2 + 1114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22263221 is a prime.

Together with 22263223, 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 = 22263193 and 22263202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22263223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11131610 + 11131611.

It is an arithmetic number, because the mean of its divisors is an integer number (11131611).

Almost surely, 2^22263221 is an apocalyptic number.

It is an amenable number.

22263221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22263221 is an equidigital number, since it uses as much as digits as its factorization.

22263221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 20.

The square root of 22263221 is about 4718.3917811051. The cubic root of 22263221 is about 281.3170140887.

Adding to 22263221 its reverse (12236222), we get a palindrome (34499443).

The spelling of 22263221 in words is "twenty-two million, two hundred sixty-three thousand, two hundred twenty-one".