20410221 has 16 divisors (see below), whose sum is σ = 29390144. Its totient is φ = 12524544.

The previous prime is 20410213. The next prime is 20410259. The reversal of 20410221 is 12201402.

It is not a de Polignac number, because 20410221 - 2³ = 20410213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20410197 and 20410206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20410721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22050 + ... + 22956.

It is an arithmetic number, because the mean of its divisors is an integer number (1836884).

Almost surely, 2^20410221 is an apocalyptic number.

It is an amenable number.

20410221 is a deficient number, since it is larger than the sum of its proper divisors (8979923).

20410221 is a wasteful number, since it uses less digits than its factorization.

20410221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 20410221 is about 4517.7672582815. The cubic root of 20410221 is about 273.2850676559.

Adding to 20410221 its reverse (12201402), we get a palindrome (32611623).

The spelling of 20410221 in words is "twenty million, four hundred ten thousand, two hundred twenty-one".