21113040111 has 4 divisors (see below), whose sum is σ = 28150720152. Its totient is φ = 14075360072.

The previous prime is 21113040059. The next prime is 21113040139. The reversal of 21113040111 is 11104031112.

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 21113040111 - 2¹⁴ = 21113023727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113040161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518840016 + ... + 3518840021.

It is an arithmetic number, because the mean of its divisors is an integer number (7037680038).

Almost surely, 2^21113040111 is an apocalyptic number.

21113040111 is a deficient number, since it is larger than the sum of its proper divisors (7037680041).

21113040111 is an equidigital number, since it uses as much as digits as its factorization.

21113040111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037680040.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21113040111 its reverse (11104031112), we get a palindrome (32217071223).

The spelling of 21113040111 in words is "twenty-one billion, one hundred thirteen million, forty thousand, one hundred eleven".