12120012111 has 4 divisors (see below), whose sum is σ = 16160016152. Its totient is φ = 8080008072.

The previous prime is 12120012077. The next prime is 12120012119. The reversal of 12120012111 is 11121002121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12120012111 - 2¹⁰ = 12120011087 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 (12120012119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2020002016 + ... + 2020002021.

It is an arithmetic number, because the mean of its divisors is an integer number (4040004038).

Almost surely, 2^12120012111 is an apocalyptic number.

12120012111 is a deficient number, since it is larger than the sum of its proper divisors (4040004041).

12120012111 is an equidigital number, since it uses as much as digits as its factorization.

12120012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040004040.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12120012111 its reverse (11121002121), we get a palindrome (23241014232).

The spelling of 12120012111 in words is "twelve billion, one hundred twenty million, twelve thousand, one hundred eleven".