16421203 has 2 divisors, whose sum is σ = 16421204. Its totient is φ = 16421202.

The previous prime is 16421191. The next prime is 16421213. The reversal of 16421203 is 30212461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16421203 is a prime.

It is not a weakly prime, because it can be changed into another prime (16421213) 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 as a sum of consecutive naturals, namely, 8210601 + 8210602.

It is an arithmetic number, because the mean of its divisors is an integer number (8210602).

Almost surely, 2^16421203 is an apocalyptic number.

16421203 is a deficient number, since it is larger than the sum of its proper divisors (1).

16421203 is an equidigital number, since it uses as much as digits as its factorization.

16421203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 16421203 is about 4052.3083545061. The cubic root of 16421203 is about 254.1762628405.

Adding to 16421203 its reverse (30212461), we get a palindrome (46633664).

The spelling of 16421203 in words is "sixteen million, four hundred twenty-one thousand, two hundred three".