21323003 has 4 divisors (see below), whose sum is σ = 22963248. Its totient is φ = 19682760.

The previous prime is 21322999. The next prime is 21323011. The reversal of 21323003 is 30032312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21323003 - 2² = 21322999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21323053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820103 + ... + 820128.

It is an arithmetic number, because the mean of its divisors is an integer number (5740812).

Almost surely, 2^21323003 is an apocalyptic number.

21323003 is a deficient number, since it is larger than the sum of its proper divisors (1640245).

21323003 is a wasteful number, since it uses less digits than its factorization.

21323003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640244.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 21323003 is about 4617.6837267184. The cubic root of 21323003 is about 277.2997359307.

Adding to 21323003 its reverse (30032312), we get a palindrome (51355315).

The spelling of 21323003 in words is "twenty-one million, three hundred twenty-three thousand, three".