21132303 has 4 divisors (see below), whose sum is σ = 28176408. Its totient is φ = 14088200.

The previous prime is 21132301. The next prime is 21132311. The reversal of 21132303 is 30323112.

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 21132303 - 2¹ = 21132301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132301) 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 3 ways as a sum of consecutive naturals, for example, 3522048 + ... + 3522053.

It is an arithmetic number, because the mean of its divisors is an integer number (7044102).

Almost surely, 2^21132303 is an apocalyptic number.

21132303 is a deficient number, since it is larger than the sum of its proper divisors (7044105).

21132303 is an equidigital number, since it uses as much as digits as its factorization.

21132303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044104.

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

The square root of 21132303 is about 4596.9884707273. The cubic root of 21132303 is about 276.4705923530.

Adding to 21132303 its reverse (30323112), we get a palindrome (51455415).

The spelling of 21132303 in words is "twenty-one million, one hundred thirty-two thousand, three hundred three".