10003721 has 16 divisors (see below), whose sum is σ = 12394368. Its totient is φ = 7862400.

The previous prime is 10003717. The next prime is 10003723. The reversal of 10003721 is 12730001.

10003721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10003721 - 2² = 10003717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10003696 and 10003705.

It is not an unprimeable number, because it can be changed into a prime (10003723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18941 + ... + 19461.

It is an arithmetic number, because the mean of its divisors is an integer number (774648).

Almost surely, 2^10003721 is an apocalyptic number.

It is an amenable number.

10003721 is a deficient number, since it is larger than the sum of its proper divisors (2390647).

10003721 is a wasteful number, since it uses less digits than its factorization.

10003721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752.

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 10003721 is about 3162.8659472067. The cubic root of 10003721 is about 215.4701878610.

Adding to 10003721 its reverse (12730001), we get a palindrome (22733722).

The spelling of 10003721 in words is "ten million, three thousand, seven hundred twenty-one".