21452303 has 4 divisors (see below), whose sum is σ = 21475368. Its totient is φ = 21429240.

The previous prime is 21452269. The next prime is 21452309. The reversal of 21452303 is 30325412.

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 21452303 - 2¹⁴ = 21435919 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452309) 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 3 ways as a sum of consecutive naturals, for example, 10076 + ... + 12017.

It is an arithmetic number, because the mean of its divisors is an integer number (5368842).

Almost surely, 2^21452303 is an apocalyptic number.

21452303 is a deficient number, since it is larger than the sum of its proper divisors (23065).

21452303 is an equidigital number, since it uses as much as digits as its factorization.

21452303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23064.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21452303 is about 4631.6630922380. The cubic root of 21452303 is about 277.8591103289.

Adding to 21452303 its reverse (30325412), we get a palindrome (51777715).

The spelling of 21452303 in words is "twenty-one million, four hundred fifty-two thousand, three hundred three".