11109721 has 12 divisors (see below), whose sum is σ = 13684788. Its totient is φ = 8961792.

The previous prime is 11109689. The next prime is 11109727. The reversal of 11109721 is 12790111.

It can be written as a sum of positive squares in 2 ways, for example, as 5934096 + 5175625 = 2436^2 + 2275^2 .

It is not a de Polignac number, because 11109721 - 2⁵ = 11109689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11109692 and 11109701.

It is not an unprimeable number, because it can be changed into a prime (11109727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5836 + ... + 7501.

It is an arithmetic number, because the mean of its divisors is an integer number (1140399).

Almost surely, 2^11109721 is an apocalyptic number.

It is an amenable number.

11109721 is a deficient number, since it is larger than the sum of its proper divisors (2575067).

11109721 is a wasteful number, since it uses less digits than its factorization.

11109721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13368 (or 13361 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 11109721 is about 3333.1248101444. The cubic root of 11109721 is about 223.1350104441.

Adding to 11109721 its reverse (12790111), we get a palindrome (23899832).

The spelling of 11109721 in words is "eleven million, one hundred nine thousand, seven hundred twenty-one".