11109901221 has 16 divisors (see below), whose sum is σ = 16494680320. Its totient is φ = 7390595520.

The previous prime is 11109901157. The next prime is 11109901259. The reversal of 11109901221 is 12210990111.

11109901221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11109901221 - 2⁶ = 11109901157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11109901021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431860 + ... + 456861.

It is an arithmetic number, because the mean of its divisors is an integer number (1030917520).

Almost surely, 2^11109901221 is an apocalyptic number.

It is an amenable number.

11109901221 is a deficient number, since it is larger than the sum of its proper divisors (5384779099).

11109901221 is an equidigital number, since it uses as much as digits as its factorization.

11109901221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889193 (or 889187 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

The spelling of 11109901221 in words is "eleven billion, one hundred nine million, nine hundred one thousand, two hundred twenty-one".