10210221 has 24 divisors (see below), whose sum is σ = 17251520. Its totient is φ = 5697216.

The previous prime is 10210219. The next prime is 10210223. The reversal of 10210221 is 12201201.

It is an interprime number because it is at equal distance from previous prime (10210219) and next prime (10210223).

It is not a de Polignac number, because 10210221 - 2¹ = 10210219 is a prime.

It is a super-2 number, since 2×10210221² = 208497225737682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10210223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 825 + ... + 4593.

Almost surely, 2^10210221 is an apocalyptic number.

It is an amenable number.

10210221 is a deficient number, since it is larger than the sum of its proper divisors (7041299).

10210221 is a wasteful number, since it uses less digits than its factorization.

10210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3825 (or 3822 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 10210221 is about 3195.3436434913. The cubic root of 10210221 is about 216.9427032712.

Adding to 10210221 its reverse (12201201), we get a palindrome (22411422).

The spelling of 10210221 in words is "ten million, two hundred ten thousand, two hundred twenty-one".