21150203 has 2 divisors, whose sum is σ = 21150204. Its totient is φ = 21150202.

The previous prime is 21150191. The next prime is 21150209. The reversal of 21150203 is 30205112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21150203 - 2⁴ = 21150187 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21150209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575101 + 10575102.

It is an arithmetic number, because the mean of its divisors is an integer number (10575102).

Almost surely, 2^21150203 is an apocalyptic number.

21150203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150203 is an equidigital number, since it uses as much as digits as its factorization.

21150203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21150203 is about 4598.9349854069. The cubic root of 21150203 is about 276.5486312834.

Adding to 21150203 its reverse (30205112), we get a palindrome (51355315).

The spelling of 21150203 in words is "twenty-one million, one hundred fifty thousand, two hundred three".