21303033 has 8 divisors (see below), whose sum is σ = 28425408. Its totient is φ = 14191344.

The previous prime is 21303031. The next prime is 21303041. The reversal of 21303033 is 33030312.

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

It is not a de Polignac number, because 21303033 - 2¹ = 21303031 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21303031) 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, 6091 + ... + 8927.

It is an arithmetic number, because the mean of its divisors is an integer number (3553176).

Almost surely, 2^21303033 is an apocalyptic number.

It is an amenable number.

21303033 is a deficient number, since it is larger than the sum of its proper divisors (7122375).

21303033 is a wasteful number, since it uses less digits than its factorization.

21303033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5343.

The product of its (nonzero) digits is 162, while the sum is 15.

The square root of 21303033 is about 4615.5208806807. The cubic root of 21303033 is about 277.2131407891.

Adding to 21303033 its reverse (33030312), we get a palindrome (54333345).

The spelling of 21303033 in words is "twenty-one million, three hundred three thousand, thirty-three".