21112122311 has 16 divisors (see below), whose sum is σ = 24726312000. Its totient is φ = 18018370944.

The previous prime is 21112122281. The next prime is 21112122319. The reversal of 21112122311 is 11322121112.

It is a happy number.

It is not a de Polignac number, because 21112122311 - 2²² = 21107928007 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 21112122311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112122319) 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 15 ways as a sum of consecutive naturals, for example, 52166 + ... + 212003.

It is an arithmetic number, because the mean of its divisors is an integer number (1545394500).

Almost surely, 2^21112122311 is an apocalyptic number.

21112122311 is a deficient number, since it is larger than the sum of its proper divisors (3614189689).

21112122311 is an equidigital number, since it uses as much as digits as its factorization.

21112122311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264423 (or 264409 counting only the distinct ones).

The product of its digits is 48, while the sum is 17.

Adding to 21112122311 its reverse (11322121112), we get a palindrome (32434243423).

The spelling of 21112122311 in words is "twenty-one billion, one hundred twelve million, one hundred twenty-two thousand, three hundred eleven".