21343203 has 16 divisors (see below), whose sum is σ = 36136960. Its totient is φ = 12196008.

The previous prime is 21343187. The next prime is 21343243. The reversal of 21343203 is 30234312.

It is not a de Polignac number, because 21343203 - 2⁴ = 21343187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21343243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56275 + ... + 56652.

It is an arithmetic number, because the mean of its divisors is an integer number (2258560).

Almost surely, 2^21343203 is an apocalyptic number.

21343203 is a deficient number, since it is larger than the sum of its proper divisors (14793757).

21343203 is a wasteful number, since it uses less digits than its factorization.

21343203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112943 (or 112937 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 21343203 is about 4619.8704527292. The cubic root of 21343203 is about 277.3872734253.

Adding to 21343203 its reverse (30234312), we get a palindrome (51577515).

The spelling of 21343203 in words is "twenty-one million, three hundred forty-three thousand, two hundred three".