21144303 has 6 divisors (see below), whose sum is σ = 30541784. Its totient is φ = 14096196.

The previous prime is 21144301. The next prime is 21144307. The reversal of 21144303 is 30344112.

It is not a de Polignac number, because 21144303 - 2¹ = 21144301 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 (21144301) 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 5 ways as a sum of consecutive naturals, for example, 1174675 + ... + 1174692.

Almost surely, 2^21144303 is an apocalyptic number.

21144303 is a deficient number, since it is larger than the sum of its proper divisors (9397481).

21144303 is a wasteful number, since it uses less digits than its factorization.

21144303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349373 (or 2349370 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21144303 is about 4598.2934878061. The cubic root of 21144303 is about 276.5229138208.

Adding to 21144303 its reverse (30344112), we get a palindrome (51488415).

The spelling of 21144303 in words is "twenty-one million, one hundred forty-four thousand, three hundred three".