11162721 has 4 divisors (see below), whose sum is σ = 14883632. Its totient is φ = 7441812.

The previous prime is 11162717. The next prime is 11162731. The reversal of 11162721 is 12726111.

It is a happy number.

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.

It is not a de Polignac number, because 11162721 - 2² = 11162717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11162731) 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, 1860451 + ... + 1860456.

It is an arithmetic number, because the mean of its divisors is an integer number (3720908).

Almost surely, 2^11162721 is an apocalyptic number.

It is an amenable number.

11162721 is a deficient number, since it is larger than the sum of its proper divisors (3720911).

11162721 is an equidigital number, since it uses as much as digits as its factorization.

11162721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720910.

The product of its digits is 168, while the sum is 21.

The square root of 11162721 is about 3341.0658478994. The cubic root of 11162721 is about 223.4892767453.

Adding to 11162721 its reverse (12726111), we get a palindrome (23888832).

The spelling of 11162721 in words is "eleven million, one hundred sixty-two thousand, seven hundred twenty-one".