11108721 has 8 divisors (see below), whose sum is σ = 15951040. Its totient is φ = 6836112.

The previous prime is 11108719. The next prime is 11108729. The reversal of 11108721 is 12780111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11108721 - 2¹ = 11108719 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11108729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142381 + ... + 142458.

It is an arithmetic number, because the mean of its divisors is an integer number (1993880).

Almost surely, 2^11108721 is an apocalyptic number.

It is an amenable number.

11108721 is a deficient number, since it is larger than the sum of its proper divisors (4842319).

11108721 is a wasteful number, since it uses less digits than its factorization.

11108721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284855.

The product of its (nonzero) digits is 112, while the sum is 21.

The square root of 11108721 is about 3332.9747973845. The cubic root of 11108721 is about 223.1283153553.

Adding to 11108721 its reverse (12780111), we get a palindrome (23888832).

The spelling of 11108721 in words is "eleven million, one hundred eight thousand, seven hundred twenty-one".