21411103 has 4 divisors (see below), whose sum is σ = 24469840. Its totient is φ = 18352368.

The previous prime is 21411083. The next prime is 21411107. The reversal of 21411103 is 30111412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21411103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411107) 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, 1529358 + ... + 1529371.

It is an arithmetic number, because the mean of its divisors is an integer number (6117460).

Almost surely, 2^21411103 is an apocalyptic number.

21411103 is a deficient number, since it is larger than the sum of its proper divisors (3058737).

21411103 is an equidigital number, since it uses as much as digits as its factorization.

21411103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3058736.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21411103 is about 4627.2133082450. The cubic root of 21411103 is about 277.6811165128.

Adding to 21411103 its reverse (30111412), we get a palindrome (51522515).

The spelling of 21411103 in words is "twenty-one million, four hundred eleven thousand, one hundred three".