21424303 has 2 divisors, whose sum is σ = 21424304. Its totient is φ = 21424302.

The previous prime is 21424297. The next prime is 21424313. The reversal of 21424303 is 30342412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21424303 - 2¹³ = 21416111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21424313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712151 + 10712152.

It is an arithmetic number, because the mean of its divisors is an integer number (10712152).

Almost surely, 2^21424303 is an apocalyptic number.

21424303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21424303 is an equidigital number, since it uses as much as digits as its factorization.

21424303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 21424303 is about 4628.6394329219. The cubic root of 21424303 is about 277.7381684974.

Adding to 21424303 its reverse (30342412), we get a palindrome (51766715).

The spelling of 21424303 in words is "twenty-one million, four hundred twenty-four thousand, three hundred three".