21321303 has 8 divisors (see below), whose sum is σ = 28465008. Its totient is φ = 14195904.

The previous prime is 21321301. The next prime is 21321331. The reversal of 21321303 is 30312312.

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

It is not a de Polignac number, because 21321303 - 2¹ = 21321301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321301) 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, 1576 + ... + 6717.

It is an arithmetic number, because the mean of its divisors is an integer number (3558126).

Almost surely, 2^21321303 is an apocalyptic number.

21321303 is a deficient number, since it is larger than the sum of its proper divisors (7143705).

21321303 is an equidigital number, since it uses as much as digits as its factorization.

21321303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9153.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21321303 is about 4617.4996480780. The cubic root of 21321303 is about 277.2923663921.

Adding to 21321303 its reverse (30312312), we get a palindrome (51633615).

The spelling of 21321303 in words is "twenty-one million, three hundred twenty-one thousand, three hundred three".