22227221 has 2 divisors, whose sum is σ = 22227222. Its totient is φ = 22227220.

The previous prime is 22227209. The next prime is 22227229. The reversal of 22227221 is 12272222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21436900 + 790321 = 4630^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 22227221 - 2⁶ = 22227157 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22227193 and 22227202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22227229) 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, 11113610 + 11113611.

It is an arithmetic number, because the mean of its divisors is an integer number (11113611).

Almost surely, 2^22227221 is an apocalyptic number.

It is an amenable number.

22227221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22227221 is an equidigital number, since it uses as much as digits as its factorization.

22227221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 448, while the sum is 20.

The square root of 22227221 is about 4714.5753785468. The cubic root of 22227221 is about 281.1653008491.

Adding to 22227221 its reverse (12272222), we get a palindrome (34499443).

The spelling of 22227221 in words is "twenty-two million, two hundred twenty-seven thousand, two hundred twenty-one".