21201203 has 2 divisors, whose sum is σ = 21201204. Its totient is φ = 21201202.

The previous prime is 21201199. The next prime is 21201209. The reversal of 21201203 is 30210212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201203 - 2² = 21201199 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600601 + 10600602.

It is an arithmetic number, because the mean of its divisors is an integer number (10600602).

Almost surely, 2^21201203 is an apocalyptic number.

21201203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201203 is an equidigital number, since it uses as much as digits as its factorization.

21201203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21201203 is about 4604.4764088873. The cubic root of 21201203 is about 276.7707356754.

Adding to 21201203 its reverse (30210212), we get a palindrome (51411415).

Subtracting 21201203 from its reverse (30210212), we obtain a palindrome (9009009).

The spelling of 21201203 in words is "twenty-one million, two hundred one thousand, two hundred three".