11221891 has 2 divisors, whose sum is σ = 11221892. Its totient is φ = 11221890.

The previous prime is 11221883. The next prime is 11221901. The reversal of 11221891 is 19812211.

It is a weak prime.

It is an emirp because it is prime and its reverse (19812211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11221891 - 2³ = 11221883 is a prime.

It is not a weakly prime, because it can be changed into another prime (11224891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610945 + 5610946.

It is an arithmetic number, because the mean of its divisors is an integer number (5610946).

Almost surely, 2^11221891 is an apocalyptic number.

11221891 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221891 is an equidigital number, since it uses as much as digits as its factorization.

11221891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 25.

The square root of 11221891 is about 3349.9091032444. The cubic root of 11221891 is about 223.8834627125.

The spelling of 11221891 in words is "eleven million, two hundred twenty-one thousand, eight hundred ninety-one".