21112212211111 has 8 divisors (see below), whose sum is σ = 24134361818624. Its totient is φ = 18091592426520.

The previous prime is 21112212211093. The next prime is 21112212211121. The reversal of 21112212211111 is 11111221221112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21112212211111 - 2¹¹ = 21112212209063 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 (21112212211121) 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 7 ways as a sum of consecutive naturals, for example, 382426155 + ... + 382481356.

It is an arithmetic number, because the mean of its divisors is an integer number (3016795227328).

Almost surely, 2^{21112212211111} is an apocalyptic number.

21112212211111 is a deficient number, since it is larger than the sum of its proper divisors (3022149607513).

21112212211111 is an equidigital number, since it uses as much as digits as its factorization.

21112212211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764911461.

The product of its digits is 32, while the sum is 19.

Adding to 21112212211111 its reverse (11111221221112), we get a palindrome (32223433432223).

It can be divided in two parts, 2111221221111 and 1, that added together give a palindrome (2111221221112).

The spelling of 21112212211111 in words is "twenty-one trillion, one hundred twelve billion, two hundred twelve million, two hundred eleven thousand, one hundred eleven".