21074503 has 4 divisors (see below), whose sum is σ = 21801240. Its totient is φ = 20347768.

The previous prime is 21074489. The next prime is 21074519. The reversal of 21074503 is 30547012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21074503 - 2⁹ = 21073991 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21074803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363325 + ... + 363382.

It is an arithmetic number, because the mean of its divisors is an integer number (5450310).

Almost surely, 2^21074503 is an apocalyptic number.

21074503 is a deficient number, since it is larger than the sum of its proper divisors (726737).

21074503 is an equidigital number, since it uses as much as digits as its factorization.

21074503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726736.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21074503 is about 4590.6974415659. The cubic root of 21074503 is about 276.2182994274.

The spelling of 21074503 in words is "twenty-one million, seventy-four thousand, five hundred three".