12001121212111 has 8 divisors (see below), whose sum is σ = 12256522974144. Its totient is φ = 11745721898400.

The previous prime is 12001121212033. The next prime is 12001121212123. The reversal of 12001121212111 is 11121212110021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12001121212111 - 2³⁹ = 11451365398223 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 (12001121252111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12056241 + ... + 13013653.

It is an arithmetic number, because the mean of its divisors is an integer number (1532065371768).

Almost surely, 2^{12001121212111} is an apocalyptic number.

12001121212111 is a deficient number, since it is larger than the sum of its proper divisors (255401762033).

12001121212111 is an equidigital number, since it uses as much as digits as its factorization.

12001121212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224161.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 12001121212111 its reverse (11121212110021), we get a palindrome (23122333322132).

The spelling of 12001121212111 in words is "twelve trillion, one billion, one hundred twenty-one million, two hundred twelve thousand, one hundred eleven".