11247721 has 4 divisors (see below), whose sum is σ = 11290752. Its totient is φ = 11204692.

The previous prime is 11247683. The next prime is 11247739. The reversal of 11247721 is 12774211.

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 a cyclic number.

It is not a de Polignac number, because 11247721 - 2¹⁷ = 11116649 is a prime.

It is a super-2 number, since 2×11247721² = 253022455387682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11247751) 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, 21121 + ... + 21646.

It is an arithmetic number, because the mean of its divisors is an integer number (2822688).

Almost surely, 2^11247721 is an apocalyptic number.

It is an amenable number.

11247721 is a deficient number, since it is larger than the sum of its proper divisors (43031).

11247721 is an equidigital number, since it uses as much as digits as its factorization.

11247721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43030.

The product of its digits is 784, while the sum is 25.

The square root of 11247721 is about 3353.7622157810. The cubic root of 11247721 is about 224.0551057558.

The spelling of 11247721 in words is "eleven million, two hundred forty-seven thousand, seven hundred twenty-one".