12111111112001 has 4 divisors (see below), whose sum is σ = 13212121213104. Its totient is φ = 11010101010900.

The previous prime is 12111111111997. The next prime is 12111111112021. The reversal of 12111111112001 is 10021111111121.

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 12111111112001 - 2² = 12111111111997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12111111112021) 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, 550505050535 + ... + 550505050556.

It is an arithmetic number, because the mean of its divisors is an integer number (3303030303276).

Almost surely, 2^{12111111112001} is an apocalyptic number.

12111111112001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12111111112001 is a deficient number, since it is larger than the sum of its proper divisors (1101010101103).

12111111112001 is a wasteful number, since it uses less digits than its factorization.

12111111112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101010101102.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 12111111112001 its reverse (10021111111121), we get a palindrome (22132222223122).

The spelling of 12111111112001 in words is "twelve trillion, one hundred eleven billion, one hundred eleven million, one hundred twelve thousand, one".