21131114111 has 4 divisors (see below), whose sum is σ = 21144566424. Its totient is φ = 21117661800.

The previous prime is 21131114101. The next prime is 21131114159. The reversal of 21131114111 is 11141113112.

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 21131114111 - 2²⁶ = 21064005247 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 21131114111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131114101) 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, 6723800 + ... + 6726941.

It is an arithmetic number, because the mean of its divisors is an integer number (5286141606).

Almost surely, 2^21131114111 is an apocalyptic number.

21131114111 is a deficient number, since it is larger than the sum of its proper divisors (13452313).

21131114111 is a wasteful number, since it uses less digits than its factorization.

21131114111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13452312.

The product of its digits is 24, while the sum is 17.

Adding to 21131114111 its reverse (11141113112), we get a palindrome (32272227223).

Subtracting from 21131114111 its reverse (11141113112), we obtain a palindrome (9990000999).

The spelling of 21131114111 in words is "twenty-one billion, one hundred thirty-one million, one hundred fourteen thousand, one hundred eleven".