12020312111 has 4 divisors (see below), whose sum is σ = 12727389312. Its totient is φ = 11313234912.

The previous prime is 12020312069. The next prime is 12020312131. The reversal of 12020312111 is 11121302021.

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 12020312111 - 2⁶ = 12020312047 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 (12020312131) 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, 353538575 + ... + 353538608.

It is an arithmetic number, because the mean of its divisors is an integer number (3181847328).

Almost surely, 2^12020312111 is an apocalyptic number.

12020312111 is a deficient number, since it is larger than the sum of its proper divisors (707077201).

12020312111 is an equidigital number, since it uses as much as digits as its factorization.

12020312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707077200.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 12020312111 its reverse (11121302021), we get a palindrome (23141614132).

The spelling of 12020312111 in words is "twelve billion, twenty million, three hundred twelve thousand, one hundred eleven".