21225303 has 24 divisors (see below), whose sum is σ = 34603920. Its totient is φ = 12418560.

The previous prime is 21225293. The next prime is 21225311. The reversal of 21225303 is 30352212.

It is not a de Polignac number, because 21225303 - 2⁴ = 21225287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225353) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 826 + ... + 6567.

It is an arithmetic number, because the mean of its divisors is an integer number (1441830).

Almost surely, 2^21225303 is an apocalyptic number.

21225303 is a deficient number, since it is larger than the sum of its proper divisors (13378617).

21225303 is a wasteful number, since it uses less digits than its factorization.

21225303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7439 (or 7436 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21225303 is about 4607.0926841122. The cubic root of 21225303 is about 276.8755669741.

Adding to 21225303 its reverse (30352212), we get a palindrome (51577515).

It can be divided in two parts, 21225 and 303, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 21225303 in words is "twenty-one million, two hundred twenty-five thousand, three hundred three".