11107215721 has 8 divisors (see below), whose sum is σ = 12696406784. Its totient is φ = 9518636160.

The previous prime is 11107215697. The next prime is 11107215739. The reversal of 11107215721 is 12751270111.

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

It is a cyclic number.

It is not a de Polignac number, because 11107215721 - 2²⁵ = 11073661289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11107215721.

It is not an unprimeable number, because it can be changed into a prime (11107215121) 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, 113265 + ... + 187198.

It is an arithmetic number, because the mean of its divisors is an integer number (1587050848).

Almost surely, 2^11107215721 is an apocalyptic number.

It is an amenable number.

11107215721 is a deficient number, since it is larger than the sum of its proper divisors (1589191063).

11107215721 is an equidigital number, since it uses as much as digits as its factorization.

11107215721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305751.

The product of its (nonzero) digits is 980, while the sum is 28.

Adding to 11107215721 its reverse (12751270111), we get a palindrome (23858485832).

The spelling of 11107215721 in words is "eleven billion, one hundred seven million, two hundred fifteen thousand, seven hundred twenty-one".