11221993 has 2 divisors, whose sum is σ = 11221994. Its totient is φ = 11221992.

The previous prime is 11221967. The next prime is 11222021. The reversal of 11221993 is 39912211.

It is an a-pointer prime, because the next prime (11222021) can be obtained adding 11221993 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10156969 + 1065024 = 3187^2 + 1032^2 .

It is an emirp because it is prime and its reverse (39912211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11221993 - 2⁵ = 11221961 is a prime.

It is not a weakly prime, because it can be changed into another prime (11221933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610996 + 5610997.

It is an arithmetic number, because the mean of its divisors is an integer number (5610997).

Almost surely, 2^11221993 is an apocalyptic number.

It is an amenable number.

11221993 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221993 is an equidigital number, since it uses as much as digits as its factorization.

11221993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 28.

The square root of 11221993 is about 3349.9243275035. The cubic root of 11221993 is about 223.8841410309.

The spelling of 11221993 in words is "eleven million, two hundred twenty-one thousand, nine hundred ninety-three".