21352203 has 6 divisors (see below), whose sum is σ = 30842084. Its totient is φ = 14234796.

The previous prime is 21352183. The next prime is 21352213. The reversal of 21352203 is 30225312.

It is not a de Polignac number, because 21352203 - 2⁶ = 21352139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21352213) 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, 1186225 + ... + 1186242.

Almost surely, 2^21352203 is an apocalyptic number.

21352203 is a deficient number, since it is larger than the sum of its proper divisors (9489881).

21352203 is a wasteful number, since it uses less digits than its factorization.

21352203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372473 (or 2372470 counting only the distinct ones).

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

The square root of 21352203 is about 4620.8444033531. The cubic root of 21352203 is about 277.4262574934.

Adding to 21352203 its reverse (30225312), we get a palindrome (51577515).

The spelling of 21352203 in words is "twenty-one million, three hundred fifty-two thousand, two hundred three".