21314503 has 4 divisors (see below), whose sum is σ = 24359440. Its totient is φ = 18269568.

The previous prime is 21314497. The next prime is 21314543. The reversal of 21314503 is 30541312.

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 21314503 - 2¹⁷ = 21183431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21314543) 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, 1522458 + ... + 1522471.

It is an arithmetic number, because the mean of its divisors is an integer number (6089860).

Almost surely, 2^21314503 is an apocalyptic number.

21314503 is a deficient number, since it is larger than the sum of its proper divisors (3044937).

21314503 is an equidigital number, since it uses as much as digits as its factorization.

21314503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3044936.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21314503 is about 4616.7632601207. The cubic root of 21314503 is about 277.2628843199.

Adding to 21314503 its reverse (30541312), we get a palindrome (51855815).

The spelling of 21314503 in words is "twenty-one million, three hundred fourteen thousand, five hundred three".