21103103 has 8 divisors (see below), whose sum is σ = 25536672. Its totient is φ = 17024256.

The previous prime is 21103087. The next prime is 21103109. The reversal of 21103103 is 30130112.

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 21103103 - 2⁴ = 21103087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103109) 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, 88550 + ... + 88787.

It is an arithmetic number, because the mean of its divisors is an integer number (3192084).

Almost surely, 2^21103103 is an apocalyptic number.

21103103 is a deficient number, since it is larger than the sum of its proper divisors (4433569).

21103103 is a wasteful number, since it uses less digits than its factorization.

21103103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177361.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 21103103 is about 4593.8113805423. The cubic root of 21103103 is about 276.3431939893.

Adding to 21103103 its reverse (30130112), we get a palindrome (51233215).

The spelling of 21103103 in words is "twenty-one million, one hundred three thousand, one hundred three".