21014003 has 4 divisors (see below), whose sum is σ = 21026160. Its totient is φ = 21001848.

The previous prime is 21013997. The next prime is 21014041. The reversal of 21014003 is 30041012.

It is a happy number.

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 21014003 - 2⁴ = 21013987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21014093) 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, 2948 + ... + 7121.

It is an arithmetic number, because the mean of its divisors is an integer number (5256540).

Almost surely, 2^21014003 is an apocalyptic number.

21014003 is a deficient number, since it is larger than the sum of its proper divisors (12157).

21014003 is a wasteful number, since it uses less digits than its factorization.

21014003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12156.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21014003 is about 4584.1032929025. The cubic root of 21014003 is about 275.9537265769.

Adding to 21014003 its reverse (30041012), we get a palindrome (51055015).

The spelling of 21014003 in words is "twenty-one million, fourteen thousand, three".