21235203 has 20 divisors (see below), whose sum is σ = 34606968. Its totient is φ = 12869280.

The previous prime is 21235183. The next prime is 21235213. The reversal of 21235203 is 30253212.

It is not a de Polignac number, because 21235203 - 2⁹ = 21234691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21235213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11026 + ... + 12807.

Almost surely, 2^21235203 is an apocalyptic number.

21235203 is a deficient number, since it is larger than the sum of its proper divisors (13371765).

21235203 is a wasteful number, since it uses less digits than its factorization.

21235203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23856 (or 23847 counting only the distinct ones).

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

The square root of 21235203 is about 4608.1669891617. The cubic root of 21235203 is about 276.9186074599.

Adding to 21235203 its reverse (30253212), we get a palindrome (51488415).

Subtracting 21235203 from its reverse (30253212), we obtain a square (9018009 = 3003²).

The spelling of 21235203 in words is "twenty-one million, two hundred thirty-five thousand, two hundred three".