11213221 has 2 divisors, whose sum is σ = 11213222. Its totient is φ = 11213220.

The previous prime is 11213219. The next prime is 11213231. The reversal of 11213221 is 12231211.

11213221 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6200100 + 5013121 = 2490^2 + 2239^2 .

It is a cyclic number.

It is not a de Polignac number, because 11213221 - 2¹ = 11213219 is a prime.

Together with 11213219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11213201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606610 + 5606611.

It is an arithmetic number, because the mean of its divisors is an integer number (5606611).

Almost surely, 2^11213221 is an apocalyptic number.

It is an amenable number.

11213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11213221 is an equidigital number, since it uses as much as digits as its factorization.

11213221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 13.

The square root of 11213221 is about 3348.6147882371. The cubic root of 11213221 is about 223.8257906225.

Adding to 11213221 its reverse (12231211), we get a palindrome (23444432).

The spelling of 11213221 in words is "eleven million, two hundred thirteen thousand, two hundred twenty-one".