10500221 has 4 divisors (see below), whose sum is σ = 10517244. Its totient is φ = 10483200.

The previous prime is 10500187. The next prime is 10500229. The reversal of 10500221 is 12200501.

10500221 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 an emirpimes, since its reverse is a distinct semiprime: 12200501 = 1543 ⋅7907.

It can be written as a sum of positive squares in 2 ways, for example, as 3667225 + 6832996 = 1915^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 10500221 - 2⁶ = 10500157 is a prime.

It is a super-2 number, since 2×10500221² = 220509282097682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10500229) 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 3 ways as a sum of consecutive naturals, for example, 7550 + ... + 8831.

It is an arithmetic number, because the mean of its divisors is an integer number (2629311).

Almost surely, 2^10500221 is an apocalyptic number.

It is an amenable number.

10500221 is a deficient number, since it is larger than the sum of its proper divisors (17023).

10500221 is an equidigital number, since it uses as much as digits as its factorization.

10500221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17022.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 10500221 is about 3240.4044500648. The cubic root of 10500221 is about 218.9774932911.

Adding to 10500221 its reverse (12200501), we get a palindrome (22700722).

The spelling of 10500221 in words is "ten million, five hundred thousand, two hundred twenty-one".