11213381 has 2 divisors, whose sum is σ = 11213382. Its totient is φ = 11213380.

The previous prime is 11213359. The next prime is 11213393. The reversal of 11213381 is 18331211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10144225 + 1069156 = 3185^2 + 1034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11213381 is a prime.

It is a super-2 number, since 2×11213381² = 251479826902322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11213281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606690 + 5606691.

It is an arithmetic number, because the mean of its divisors is an integer number (5606691).

Almost surely, 2^11213381 is an apocalyptic number.

It is an amenable number.

11213381 is a deficient number, since it is larger than the sum of its proper divisors (1).

11213381 is an equidigital number, since it uses as much as digits as its factorization.

11213381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 20.

The square root of 11213381 is about 3348.6386786275. The cubic root of 11213381 is about 223.8268551978.

Adding to 11213381 its reverse (18331211), we get a palindrome (29544592).

The spelling of 11213381 in words is "eleven million, two hundred thirteen thousand, three hundred eighty-one".