11109990221 has 24 divisors (see below), whose sum is σ = 12653534880. Its totient is φ = 9741137120.

The previous prime is 11109990217. The next prime is 11109990271. The reversal of 11109990221 is 12209990111.

It is not a de Polignac number, because 11109990221 - 2² = 11109990217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11109990271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 363686 + ... + 393048.

It is an arithmetic number, because the mean of its divisors is an integer number (527230620).

Almost surely, 2^11109990221 is an apocalyptic number.

11109990221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11109990221 is a deficient number, since it is larger than the sum of its proper divisors (1543544659).

11109990221 is a wasteful number, since it uses less digits than its factorization.

11109990221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29497 (or 29486 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 35.

The spelling of 11109990221 in words is "eleven billion, one hundred nine million, nine hundred ninety thousand, two hundred twenty-one".