21113422111 has 4 divisors (see below), whose sum is σ = 21242952472. Its totient is φ = 20983891752.

The previous prime is 21113422103. The next prime is 21113422133. The reversal of 21113422111 is 11122431112.

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 21113422111 - 2³ = 21113422103 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 (21113422411) 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, 64764936 + ... + 64765261.

It is an arithmetic number, because the mean of its divisors is an integer number (5310738118).

Almost surely, 2^21113422111 is an apocalyptic number.

21113422111 is a deficient number, since it is larger than the sum of its proper divisors (129530361).

21113422111 is a wasteful number, since it uses less digits than its factorization.

21113422111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129530360.

The product of its digits is 96, while the sum is 19.

Adding to 21113422111 its reverse (11122431112), we get a palindrome (32235853223).

Subtracting from 21113422111 its reverse (11122431112), we obtain a palindrome (9990990999).

The spelling of 21113422111 in words is "twenty-one billion, one hundred thirteen million, four hundred twenty-two thousand, one hundred eleven".