21113303111 has 4 divisors (see below), whose sum is σ = 21129684000. Its totient is φ = 21096922224.

The previous prime is 21113303093. The next prime is 21113303117. The reversal of 21113303111 is 11130331112.

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

It is a cyclic number.

It is not a de Polignac number, because 21113303111 - 2¹⁸ = 21113040967 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 21113303111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113303117) 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, 8188511 + ... + 8191088.

It is an arithmetic number, because the mean of its divisors is an integer number (5282421000).

Almost surely, 2^21113303111 is an apocalyptic number.

21113303111 is a deficient number, since it is larger than the sum of its proper divisors (16380889).

21113303111 is a wasteful number, since it uses less digits than its factorization.

21113303111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16380888.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 21113303111 its reverse (11130331112), we get a palindrome (32243634223).

The spelling of 21113303111 in words is "twenty-one billion, one hundred thirteen million, three hundred three thousand, one hundred eleven".