11160721 has 16 divisors (see below), whose sum is σ = 13886208. Its totient is φ = 8812800.

The previous prime is 11160707. The next prime is 11160757. The reversal of 11160721 is 12706111.

It is not a de Polignac number, because 11160721 - 2⁹ = 11160209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11160701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136 + ... + 4726.

It is an arithmetic number, because the mean of its divisors is an integer number (867888).

Almost surely, 2^11160721 is an apocalyptic number.

11160721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11160721 is a deficient number, since it is larger than the sum of its proper divisors (2725487).

11160721 is a wasteful number, since it uses less digits than its factorization.

11160721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4632.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 11160721 is about 3340.7665288074. The cubic root of 11160721 is about 223.4759285885.

Adding to 11160721 its reverse (12706111), we get a palindrome (23866832).

It can be divided in two parts, 111607 and 21, that added together give a triangular number (111628 = T₄₇₂).

The spelling of 11160721 in words is "eleven million, one hundred sixty thousand, seven hundred twenty-one".