21300221 has 8 divisors (see below), whose sum is σ = 21567840. Its totient is φ = 21034512.

The previous prime is 21300203. The next prime is 21300233. The reversal of 21300221 is 12200312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21300221 - 2²² = 17105917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40466 + ... + 40988.

It is an arithmetic number, because the mean of its divisors is an integer number (2695980).

Almost surely, 2^21300221 is an apocalyptic number.

It is an amenable number.

21300221 is a deficient number, since it is larger than the sum of its proper divisors (267619).

21300221 is a wasteful number, since it uses less digits than its factorization.

21300221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21300221 is about 4615.2162462879. The cubic root of 21300221 is about 277.2009428757.

Adding to 21300221 its reverse (12200312), we get a palindrome (33500533).

Subtracting from 21300221 its reverse (12200312), we obtain a palindrome (9099909).

The spelling of 21300221 in words is "twenty-one million, three hundred thousand, two hundred twenty-one".