11147721 has 8 divisors (see below), whose sum is σ = 16007040. Its totient is φ = 6860112.

The previous prime is 11147713. The next prime is 11147729. The reversal of 11147721 is 12774111.

It is an interprime number because it is at equal distance from previous prime (11147713) and next prime (11147729).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11147721 - 2³ = 11147713 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11147691 and 11147700.

It is not an unprimeable number, because it can be changed into a prime (11147729) 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 7 ways as a sum of consecutive naturals, for example, 142881 + ... + 142958.

It is an arithmetic number, because the mean of its divisors is an integer number (2000880).

Almost surely, 2^11147721 is an apocalyptic number.

It is an amenable number.

11147721 is a deficient number, since it is larger than the sum of its proper divisors (4859319).

11147721 is a wasteful number, since it uses less digits than its factorization.

11147721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285855.

The product of its digits is 392, while the sum is 24.

The square root of 11147721 is about 3338.8203006451. The cubic root of 11147721 is about 223.3891266758.

The spelling of 11147721 in words is "eleven million, one hundred forty-seven thousand, seven hundred twenty-one".