22013221 has 2 divisors, whose sum is σ = 22013222. Its totient is φ = 22013220.

The previous prime is 22013209. The next prime is 22013227. The reversal of 22013221 is 12231022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20349121 + 1664100 = 4511^2 + 1290^2 .

It is a cyclic number.

It is not a de Polignac number, because 22013221 - 2¹⁷ = 21882149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22013227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11006610 + 11006611.

It is an arithmetic number, because the mean of its divisors is an integer number (11006611).

Almost surely, 2^22013221 is an apocalyptic number.

It is an amenable number.

22013221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22013221 is an equidigital number, since it uses as much as digits as its factorization.

22013221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 22013221 is about 4691.8249114817. The cubic root of 22013221 is about 280.2600517679.

Adding to 22013221 its reverse (12231022), we get a palindrome (34244243).

The spelling of 22013221 in words is "twenty-two million, thirteen thousand, two hundred twenty-one".