10004221 has 4 divisors (see below), whose sum is σ = 10011100. Its totient is φ = 9997344.

The previous prime is 10004207. The next prime is 10004231. The reversal of 10004221 is 12240001.

10004221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12240001 = 29 ⋅422069.

It can be written as a sum of positive squares in 2 ways, for example, as 4575321 + 5428900 = 2139^2 + 2330^2 .

It is a cyclic number.

It is not a de Polignac number, because 10004221 - 2²¹ = 7907069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10004198 and 10004207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10004201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306 + ... + 4483.

It is an arithmetic number, because the mean of its divisors is an integer number (2502775).

Almost surely, 2^10004221 is an apocalyptic number.

It is an amenable number.

10004221 is a deficient number, since it is larger than the sum of its proper divisors (6879).

10004221 is an equidigital number, since it uses as much as digits as its factorization.

10004221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6878.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 10004221 is about 3162.9449884562. The cubic root of 10004221 is about 215.4737776353.

Adding to 10004221 its reverse (12240001), we get a palindrome (22244222).

The spelling of 10004221 in words is "ten million, four thousand, two hundred twenty-one".