11110721 has 4 divisors (see below), whose sum is σ = 11118000. Its totient is φ = 11103444.

The previous prime is 11110717. The next prime is 11110769. The reversal of 11110721 is 12701111.

11110721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11110721 - 2² = 11110717 is a prime.

It is a super-2 number, since 2×11110721² = 246896242279682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11110696 and 11110705.

It is not an unprimeable number, because it can be changed into a prime (11110711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371 + ... + 4728.

It is an arithmetic number, because the mean of its divisors is an integer number (2779500).

Almost surely, 2^11110721 is an apocalyptic number.

It is an amenable number.

11110721 is a deficient number, since it is larger than the sum of its proper divisors (7279).

11110721 is an equidigital number, since it uses as much as digits as its factorization.

11110721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7278.

The product of its (nonzero) digits is 14, while the sum is 14.

The square root of 11110721 is about 3333.2748161530. The cubic root of 11110721 is about 223.1417051312.

Adding to 11110721 its reverse (12701111), we get a palindrome (23811832).

The spelling of 11110721 in words is "eleven million, one hundred ten thousand, seven hundred twenty-one".