21303301 has 2 divisors, whose sum is σ = 21303302. Its totient is φ = 21303300.

The previous prime is 21303283. The next prime is 21303311. The reversal of 21303301 is 10330312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13468900 + 7834401 = 3670^2 + 2799^2 .

It is a cyclic number.

It is not a de Polignac number, because 21303301 - 2⁹ = 21302789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21303311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651650 + 10651651.

It is an arithmetic number, because the mean of its divisors is an integer number (10651651).

Almost surely, 2^21303301 is an apocalyptic number.

It is an amenable number.

21303301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303301 is an equidigital number, since it uses as much as digits as its factorization.

21303301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 21303301 is about 4615.5499130656. The cubic root of 21303301 is about 277.2143032654.

Adding to 21303301 its reverse (10330312), we get a palindrome (31633613).

The spelling of 21303301 in words is "twenty-one million, three hundred three thousand, three hundred one".