21303039 has 8 divisors (see below), whose sum is σ = 28509952. Its totient is φ = 14149080.

The previous prime is 21303031. The next prime is 21303041. The reversal of 21303039 is 93030312.

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

It is not a de Polignac number, because 21303039 - 2³ = 21303031 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 (21303031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12289 + ... + 13914.

It is an arithmetic number, because the mean of its divisors is an integer number (3563744).

Almost surely, 2^21303039 is an apocalyptic number.

21303039 is a deficient number, since it is larger than the sum of its proper divisors (7206913).

21303039 is a wasteful number, since it uses less digits than its factorization.

21303039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26477.

The product of its (nonzero) digits is 486, while the sum is 21.

The square root of 21303039 is about 4615.5215306615. The cubic root of 21303039 is about 277.2131668148.

It can be divided in two parts, 2130303 and 9, that added together give a palindrome (2130312).

The spelling of 21303039 in words is "twenty-one million, three hundred three thousand, thirty-nine".