22204421 has 2 divisors, whose sum is σ = 22204422. Its totient is φ = 22204420.

The previous prime is 22204417. The next prime is 22204433. The reversal of 22204421 is 12440222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20205025 + 1999396 = 4495^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 22204421 - 2² = 22204417 is a prime.

It is a Chen prime.

It is equal to p_1401263 and since 22204421 and 1401263 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22204421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22204471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11102210 + 11102211.

It is an arithmetic number, because the mean of its divisors is an integer number (11102211).

Almost surely, 2^22204421 is an apocalyptic number.

It is an amenable number.

22204421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22204421 is an equidigital number, since it uses as much as digits as its factorization.

22204421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 22204421 is about 4712.1567248978. The cubic root of 22204421 is about 281.0691310516.

Adding to 22204421 its reverse (12440222), we get a palindrome (34644643).

The spelling of 22204421 in words is "twenty-two million, two hundred four thousand, four hundred twenty-one".