11112721 has 2 divisors, whose sum is σ = 11112722. Its totient is φ = 11112720.

The previous prime is 11112677. The next prime is 11112733. The reversal of 11112721 is 12721111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6656400 + 4456321 = 2580^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 11112721 - 2⁷ = 11112593 is a prime.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 11112695 and 11112704.

It is not a weakly prime, because it can be changed into another prime (11112421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5556360 + 5556361.

It is an arithmetic number, because the mean of its divisors is an integer number (5556361).

Almost surely, 2^11112721 is an apocalyptic number.

It is an amenable number.

11112721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11112721 is an equidigital number, since it uses as much as digits as its factorization.

11112721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28, while the sum is 16.

The square root of 11112721 is about 3333.5748079202. The cubic root of 11112721 is about 223.1550933003.

Adding to 11112721 its reverse (12721111), we get a palindrome (23833832).

The spelling of 11112721 in words is "eleven million, one hundred twelve thousand, seven hundred twenty-one".