21000111103 has 8 divisors (see below), whose sum is σ = 21079618560. Its totient is φ = 20920681080.

The previous prime is 21000111091. The next prime is 21000111113. The reversal of 21000111103 is 30111100012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000111103 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 21000111103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000111113) 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, 556138 + ... + 592696.

It is an arithmetic number, because the mean of its divisors is an integer number (2634952320).

Almost surely, 2^21000111103 is an apocalyptic number.

21000111103 is a deficient number, since it is larger than the sum of its proper divisors (79507457).

21000111103 is a wasteful number, since it uses less digits than its factorization.

21000111103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38717.

The product of its (nonzero) digits is 6, while the sum is 10.

Adding to 21000111103 its reverse (30111100012), we get a palindrome (51111211115).

The spelling of 21000111103 in words is "twenty-one billion, one hundred eleven thousand, one hundred three".