21111003311103 has 12 divisors (see below), whose sum is σ = 31237419534048. Its totient is φ = 13730733860640.

The previous prime is 21111003311087. The next prime is 21111003311129. The reversal of 21111003311103 is 30111330011112.

21111003311103 is a `hidden beast` number, since 211 + 1 + 10 + 0 + 331 + 110 + 3 = 666.

It is not a de Polignac number, because 21111003311103 - 2⁴ = 21111003311087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111003312103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28605695175 + ... + 28605695912.

It is an arithmetic number, because the mean of its divisors is an integer number (2603118294504).

Almost surely, 2^{21111003311103} is an apocalyptic number.

21111003311103 is a deficient number, since it is larger than the sum of its proper divisors (10126416222945).

21111003311103 is a wasteful number, since it uses less digits than its factorization.

21111003311103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57211391134 (or 57211391131 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

Adding to 21111003311103 its reverse (30111330011112), we get a palindrome (51222333322215).

The spelling of 21111003311103 in words is "twenty-one trillion, one hundred eleven billion, three million, three hundred eleven thousand, one hundred three".