21041203 has 2 divisors, whose sum is σ = 21041204. Its totient is φ = 21041202.

The previous prime is 21041201. The next prime is 21041213. The reversal of 21041203 is 30214012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21041203 - 2¹ = 21041201 is a prime.

Together with 21041201, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21041201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520601 + 10520602.

It is an arithmetic number, because the mean of its divisors is an integer number (10520602).

Almost surely, 2^21041203 is an apocalyptic number.

21041203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041203 is an equidigital number, since it uses as much as digits as its factorization.

21041203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21041203 is about 4587.0691078291. The cubic root of 21041203 is about 276.0727377776.

Adding to 21041203 its reverse (30214012), we get a palindrome (51255215).

The spelling of 21041203 in words is "twenty-one million, forty-one thousand, two hundred three".