21197203 has 2 divisors, whose sum is σ = 21197204. Its totient is φ = 21197202.

The previous prime is 21197177. The next prime is 21197207. The reversal of 21197203 is 30279112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21197203 - 2⁹ = 21196691 is a prime.

It is not a weakly prime, because it can be changed into another prime (21197207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10598601 + 10598602.

It is an arithmetic number, because the mean of its divisors is an integer number (10598602).

Almost surely, 2^21197203 is an apocalyptic number.

21197203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21197203 is an equidigital number, since it uses as much as digits as its factorization.

21197203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 21197203 is about 4604.0420284789. The cubic root of 21197203 is about 276.7533286039.

The spelling of 21197203 in words is "twenty-one million, one hundred ninety-seven thousand, two hundred three".