21113103103 has 4 divisors (see below), whose sum is σ = 21114136240. Its totient is φ = 21112069968.

The previous prime is 21113103091. The next prime is 21113103113. The reversal of 21113103103 is 30130131112.

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-21113103103 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 (21113103113) 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, 485283 + ... + 526996.

It is an arithmetic number, because the mean of its divisors is an integer number (5278534060).

Almost surely, 2^21113103103 is an apocalyptic number.

21113103103 is a deficient number, since it is larger than the sum of its proper divisors (1033137).

21113103103 is a wasteful number, since it uses less digits than its factorization.

21113103103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033136.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21113103103 its reverse (30130131112), we get a palindrome (51243234215).

The spelling of 21113103103 in words is "twenty-one billion, one hundred thirteen million, one hundred three thousand, one hundred three".