11721003 has 16 divisors (see below), whose sum is σ = 18199296. Its totient is φ = 6570720.

The previous prime is 11720981. The next prime is 11721013. The reversal of 11721003 is 30012711.

It is not a de Polignac number, because 11721003 - 2¹⁶ = 11655467 is a prime.

It is a super-2 number, since 2×11721003² = 274763822652018, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 4153 + ... + 6378.

It is an arithmetic number, because the mean of its divisors is an integer number (1137456).

Almost surely, 2^11721003 is an apocalyptic number.

11721003 is a deficient number, since it is larger than the sum of its proper divisors (6478293).

11721003 is a wasteful number, since it uses less digits than its factorization.

11721003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10594.

The product of its (nonzero) digits is 42, while the sum is 15.

The square root of 11721003 is about 3423.5950403049. The cubic root of 11721003 is about 227.1546295186.

Adding to 11721003 its reverse (30012711), we get a palindrome (41733714).

The spelling of 11721003 in words is "eleven million, seven hundred twenty-one thousand, three".