21411003 has 4 divisors (see below), whose sum is σ = 28548008. Its totient is φ = 14274000.

The previous prime is 21410981. The next prime is 21411011. The reversal of 21411003 is 30011412.

It is a happy number.

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

It is not a de Polignac number, because 21411003 - 2⁵ = 21410971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21411003.

It is not an unprimeable number, because it can be changed into a prime (21411023) 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, 3568498 + ... + 3568503.

It is an arithmetic number, because the mean of its divisors is an integer number (7137002).

Almost surely, 2^21411003 is an apocalyptic number.

21411003 is a deficient number, since it is larger than the sum of its proper divisors (7137005).

21411003 is an equidigital number, since it uses as much as digits as its factorization.

21411003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7137004.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21411003 is about 4627.2025025927. The cubic root of 21411003 is about 277.6806842114.

Adding to 21411003 its reverse (30011412), we get a palindrome (51422415).

The spelling of 21411003 in words is "twenty-one million, four hundred eleven thousand, three".