21038203 has 2 divisors, whose sum is σ = 21038204. Its totient is φ = 21038202.

The previous prime is 21038183. The next prime is 21038209. The reversal of 21038203 is 30283012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21038203 - 2²¹ = 18941051 is a prime.

It is not a weakly prime, because it can be changed into another prime (21038209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10519101 + 10519102.

It is an arithmetic number, because the mean of its divisors is an integer number (10519102).

Almost surely, 2^21038203 is an apocalyptic number.

21038203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21038203 is an equidigital number, since it uses as much as digits as its factorization.

21038203 is an evil number, because the sum of its binary digits is even.

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

The square root of 21038203 is about 4586.7420899806. The cubic root of 21038203 is about 276.0596165764.

The spelling of 21038203 in words is "twenty-one million, thirty-eight thousand, two hundred three".