11213281 has 2 divisors, whose sum is σ = 11213282. Its totient is φ = 11213280.

The previous prime is 11213233. The next prime is 11213299. The reversal of 11213281 is 18231211.

11213281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9096256 + 2117025 = 3016^2 + 1455^2 .

It is an emirp because it is prime and its reverse (18231211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11213281 - 2¹⁷ = 11082209 is a prime.

It is a super-2 number, since 2×11213281² = 251475341569922, which contains 22 as substring.

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, 5606640 + 5606641.

It is an arithmetic number, because the mean of its divisors is an integer number (5606641).

Almost surely, 2^11213281 is an apocalyptic number.

It is an amenable number.

11213281 is a deficient number, since it is larger than the sum of its proper divisors (1).

11213281 is an equidigital number, since it uses as much as digits as its factorization.

11213281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 19.

The square root of 11213281 is about 3348.6237471534. The cubic root of 11213281 is about 223.8261898394.

Adding to 11213281 its reverse (18231211), we get a palindrome (29444492).

The spelling of 11213281 in words is "eleven million, two hundred thirteen thousand, two hundred eighty-one".