22302221 has 2 divisors, whose sum is σ = 22302222. Its totient is φ = 22302220.

The previous prime is 22302211. The next prime is 22302227. The reversal of 22302221 is 12220322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12348196 + 9954025 = 3514^2 + 3155^2 .

It is a cyclic number.

It is not a de Polignac number, because 22302221 - 2²² = 18107917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22302196 and 22302205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22302227) 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, 11151110 + 11151111.

It is an arithmetic number, because the mean of its divisors is an integer number (11151111).

Almost surely, 2^22302221 is an apocalyptic number.

It is an amenable number.

22302221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22302221 is an equidigital number, since it uses as much as digits as its factorization.

22302221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 22302221 is about 4722.5227368431. The cubic root of 22302221 is about 281.4811856515.

Adding to 22302221 its reverse (12220322), we get a palindrome (34522543).

The spelling of 22302221 in words is "twenty-two million, three hundred two thousand, two hundred twenty-one".