21141112111 has 4 divisors (see below), whose sum is σ = 24161270992. Its totient is φ = 18120953232.

The previous prime is 21141112087. The next prime is 21141112117. The reversal of 21141112111 is 11121114112.

It is a happy number.

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 21141112111 - 2⁷ = 21141111983 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 (21141112117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1510079430 + ... + 1510079443.

It is an arithmetic number, because the mean of its divisors is an integer number (6040317748).

Almost surely, 2^21141112111 is an apocalyptic number.

21141112111 is a deficient number, since it is larger than the sum of its proper divisors (3020158881).

21141112111 is an equidigital number, since it uses as much as digits as its factorization.

21141112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020158880.

The product of its digits is 16, while the sum is 16.

Adding to 21141112111 its reverse (11121114112), we get a palindrome (32262226223).

The spelling of 21141112111 in words is "twenty-one billion, one hundred forty-one million, one hundred twelve thousand, one hundred eleven".