21034003 has 2 divisors, whose sum is σ = 21034004. Its totient is φ = 21034002.

The previous prime is 21033989. The next prime is 21034033. The reversal of 21034003 is 30043012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21034003 - 2¹³ = 21025811 is a prime.

It is not a weakly prime, because it can be changed into another prime (21034033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517001 + 10517002.

It is an arithmetic number, because the mean of its divisors is an integer number (10517002).

Almost surely, 2^21034003 is an apocalyptic number.

21034003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21034003 is an equidigital number, since it uses as much as digits as its factorization.

21034003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21034003 is about 4586.2842258194. The cubic root of 21034003 is about 276.0412447988.

Adding to 21034003 its reverse (30043012), we get a palindrome (51077015).

Subtracting 21034003 from its reverse (30043012), we obtain a palindrome (9009009).

The spelling of 21034003 in words is "twenty-one million, thirty-four thousand, three".