21122303 has 4 divisors (see below), whose sum is σ = 22040688. Its totient is φ = 20203920.

The previous prime is 21122291. The next prime is 21122323. The reversal of 21122303 is 30322112.

It is a happy number.

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 21122303 - 2²⁴ = 4345087 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 (21122323) 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, 459158 + ... + 459203.

It is an arithmetic number, because the mean of its divisors is an integer number (5510172).

Almost surely, 2^21122303 is an apocalyptic number.

21122303 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21122303 is a deficient number, since it is larger than the sum of its proper divisors (918385).

21122303 is an equidigital number, since it uses as much as digits as its factorization.

21122303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918384.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21122303 is about 4595.9006734263. The cubic root of 21122303 is about 276.4269759973.

Adding to 21122303 its reverse (30322112), we get a palindrome (51444415).

The spelling of 21122303 in words is "twenty-one million, one hundred twenty-two thousand, three hundred three".