21416003 has 8 divisors (see below), whose sum is σ = 24503808. Its totient is φ = 18335304.

The previous prime is 21415991. The next prime is 21416023. The reversal of 21416003 is 30061412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21416003 - 2⁴ = 21415987 is a prime.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (21416023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9350 + ... + 11412.

It is an arithmetic number, because the mean of its divisors is an integer number (3062976).

Almost surely, 2^21416003 is an apocalyptic number.

21416003 is a deficient number, since it is larger than the sum of its proper divisors (3087805).

21416003 is a wasteful number, since it uses less digits than its factorization.

21416003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21416003 is about 4627.7427543026. The cubic root of 21416003 is about 277.7022976369.

Adding to 21416003 its reverse (30061412), we get a palindrome (51477415).

The spelling of 21416003 in words is "twenty-one million, four hundred sixteen thousand, three".