12105321011 has 16 divisors (see below), whose sum is σ = 14086170624. Its totient is φ = 10188345024.

The previous prime is 12105321001. The next prime is 12105321023. The reversal of 12105321011 is 11012350121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12105321011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12105321001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105566 + ... + 188028.

It is an arithmetic number, because the mean of its divisors is an integer number (880385664).

Almost surely, 2^12105321011 is an apocalyptic number.

12105321011 is a deficient number, since it is larger than the sum of its proper divisors (1980849613).

12105321011 is an equidigital number, since it uses as much as digits as its factorization.

12105321011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82850.

The product of its (nonzero) digits is 60, while the sum is 17.

Adding to 12105321011 its reverse (11012350121), we get a palindrome (23117671132).

The spelling of 12105321011 in words is "twelve billion, one hundred five million, three hundred twenty-one thousand, eleven".