11307721 has 4 divisors (see below), whose sum is σ = 11348244. Its totient is φ = 11267200.

The previous prime is 11307719. The next prime is 11307733. The reversal of 11307721 is 12770311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3822025 + 7485696 = 1955^2 + 2736^2 .

It is a cyclic number.

It is not a de Polignac number, because 11307721 - 2¹ = 11307719 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11307692 and 11307701.

It is not an unprimeable number, because it can be changed into a prime (11307761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19840 + ... + 20401.

It is an arithmetic number, because the mean of its divisors is an integer number (2837061).

Almost surely, 2^11307721 is an apocalyptic number.

It is an amenable number.

11307721 is a deficient number, since it is larger than the sum of its proper divisors (40523).

11307721 is an equidigital number, since it uses as much as digits as its factorization.

11307721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40522.

The product of its (nonzero) digits is 294, while the sum is 22.

The square root of 11307721 is about 3362.6954961756. The cubic root of 11307721 is about 224.4528003312.

The spelling of 11307721 in words is "eleven million, three hundred seven thousand, seven hundred twenty-one".