21201303 has 16 divisors (see below), whose sum is σ = 29321216. Its totient is φ = 13612320.

The previous prime is 21201293. The next prime is 21201311. The reversal of 21201303 is 30310212.

It is a happy number.

It is not a de Polignac number, because 21201303 - 2⁴ = 21201287 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 (21201373) 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 15 ways as a sum of consecutive naturals, for example, 25350 + ... + 26172.

It is an arithmetic number, because the mean of its divisors is an integer number (1832576).

Almost surely, 2^21201303 is an apocalyptic number.

21201303 is a deficient number, since it is larger than the sum of its proper divisors (8119913).

21201303 is a wasteful number, since it uses less digits than its factorization.

21201303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21201303 is about 4604.4872678725. The cubic root of 21201303 is about 276.7711708242.

Adding to 21201303 its reverse (30310212), we get a palindrome (51511515).

The spelling of 21201303 in words is "twenty-one million, two hundred one thousand, three hundred three".