12120111001 has 4 divisors (see below), whose sum is σ = 12758011600. Its totient is φ = 11482210404.

The previous prime is 12120110987. The next prime is 12120111007. The reversal of 12120111001 is 10011102121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12120111001 - 2⁹ = 12120110489 is a prime.

It is a super-2 number, since 2×12120111001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12120111007) 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, 318950271 + ... + 318950308.

It is an arithmetic number, because the mean of its divisors is an integer number (3189502900).

Almost surely, 2^12120111001 is an apocalyptic number.

It is an amenable number.

12120111001 is a deficient number, since it is larger than the sum of its proper divisors (637900599).

12120111001 is an equidigital number, since it uses as much as digits as its factorization.

12120111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637900598.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 12120111001 its reverse (10011102121), we get a palindrome (22131213122).

The spelling of 12120111001 in words is "twelve billion, one hundred twenty million, one hundred eleven thousand, one".