11221633991 has 2 divisors, whose sum is σ = 11221633992. Its totient is φ = 11221633990.

The previous prime is 11221633963. The next prime is 11221633999. The reversal of 11221633991 is 19933612211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11221633991 - 2¹⁰ = 11221632967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11221633999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610816995 + 5610816996.

It is an arithmetic number, because the mean of its divisors is an integer number (5610816996).

Almost surely, 2^11221633991 is an apocalyptic number.

11221633991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221633991 is an equidigital number, since it uses as much as digits as its factorization.

11221633991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 38.

The spelling of 11221633991 in words is "eleven billion, two hundred twenty-one million, six hundred thirty-three thousand, nine hundred ninety-one".