11721017 has 24 divisors (see below), whose sum is σ = 15218112. Its totient is φ = 8769600.

The previous prime is 11721013. The next prime is 11721023. The reversal of 11721017 is 71012711.

It is not a de Polignac number, because 11721017 - 2² = 11721013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11721017.

It is not an unprimeable number, because it can be changed into a prime (11721013) 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 23 ways as a sum of consecutive naturals, for example, 64667 + ... + 64847.

It is an arithmetic number, because the mean of its divisors is an integer number (634088).

Almost surely, 2^11721017 is an apocalyptic number.

It is an amenable number.

11721017 is a deficient number, since it is larger than the sum of its proper divisors (3497095).

11721017 is a wasteful number, since it uses less digits than its factorization.

11721017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 228 counting only the distinct ones).

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

The square root of 11721017 is about 3423.5970849386. The cubic root of 11721017 is about 227.1547199592.

Adding to 11721017 its reverse (71012711), we get a palindrome (82733728).

The spelling of 11721017 in words is "eleven million, seven hundred twenty-one thousand, seventeen".