22413221 has 2 divisors, whose sum is σ = 22413222. Its totient is φ = 22413220.

The previous prime is 22413187. The next prime is 22413229. The reversal of 22413221 is 12231422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20205025 + 2208196 = 4495^2 + 1486^2 .

It is a cyclic number.

It is not a de Polignac number, because 22413221 - 2¹⁰ = 22412197 is a prime.

It is a super-3 number, since 3×22413221³ (a number of 23 digits) contains 333 as substring.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 22413221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22413229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11206610 + 11206611.

It is an arithmetic number, because the mean of its divisors is an integer number (11206611).

Almost surely, 2^22413221 is an apocalyptic number.

It is an amenable number.

22413221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22413221 is an equidigital number, since it uses as much as digits as its factorization.

22413221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 22413221 is about 4734.2603434961. The cubic root of 22413221 is about 281.9473980991.

Adding to 22413221 its reverse (12231422), we get a palindrome (34644643).

The spelling of 22413221 in words is "twenty-two million, four hundred thirteen thousand, two hundred twenty-one".