21300203 has 2 divisors, whose sum is σ = 21300204. Its totient is φ = 21300202.

The previous prime is 21300199. The next prime is 21300233. The reversal of 21300203 is 30200312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21300203 - 2² = 21300199 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21300233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650101 + 10650102.

It is an arithmetic number, because the mean of its divisors is an integer number (10650102).

Almost surely, 2^21300203 is an apocalyptic number.

21300203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300203 is an equidigital number, since it uses as much as digits as its factorization.

21300203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 21300203 is about 4615.2142962164. The cubic root of 21300203 is about 277.2008647917.

Adding to 21300203 its reverse (30200312), we get a palindrome (51500515).

The spelling of 21300203 in words is "twenty-one million, three hundred thousand, two hundred three".