11107721 has 4 divisors (see below), whose sum is σ = 11114772. Its totient is φ = 11100672.

The previous prime is 11107709. The next prime is 11107727. The reversal of 11107721 is 12770111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12770111 = 17 ⋅751183.

It can be written as a sum of positive squares in 2 ways, for example, as 8094025 + 3013696 = 2845^2 + 1736^2 .

It is a cyclic number.

It is not a de Polignac number, because 11107721 - 2¹⁸ = 10845577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11107693 and 11107702.

It is not an unprimeable number, because it can be changed into a prime (11107727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41 + ... + 4713.

It is an arithmetic number, because the mean of its divisors is an integer number (2778693).

Almost surely, 2^11107721 is an apocalyptic number.

It is an amenable number.

11107721 is a deficient number, since it is larger than the sum of its proper divisors (7051).

11107721 is an equidigital number, since it uses as much as digits as its factorization.

11107721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7050.

The product of its (nonzero) digits is 98, while the sum is 20.

The square root of 11107721 is about 3332.8247778724. The cubic root of 11107721 is about 223.1216198647.

Adding to 11107721 its reverse (12770111), we get a palindrome (23877832).

The spelling of 11107721 in words is "eleven million, one hundred seven thousand, seven hundred twenty-one".