21382303 has 2 divisors, whose sum is σ = 21382304. Its totient is φ = 21382302.

The previous prime is 21382297. The next prime is 21382307. The reversal of 21382303 is 30328312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21382303 - 2⁵ = 21382271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21382307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10691151 + 10691152.

It is an arithmetic number, because the mean of its divisors is an integer number (10691152).

Almost surely, 2^21382303 is an apocalyptic number.

21382303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21382303 is an equidigital number, since it uses as much as digits as its factorization.

21382303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 21382303 is about 4624.1002368028. The cubic root of 21382303 is about 277.5565580145.

It can be divided in two parts, 21382 and 303, that multiplied together give a palindrome (6478746).

The spelling of 21382303 in words is "twenty-one million, three hundred eighty-two thousand, three hundred three".