12021212111111 has 16 divisors (see below), whose sum is σ = 15312291413760. Its totient is φ = 9187374844800.

The previous prime is 12021212111101. The next prime is 12021212111147. The reversal of 12021212111111 is 11111121212021.

12021212111111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-12021212111111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12021212111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021212111101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2658381665 + ... + 2658386186.

It is an arithmetic number, because the mean of its divisors is an integer number (957018213360).

Almost surely, 2^{12021212111111} is an apocalyptic number.

12021212111111 is a deficient number, since it is larger than the sum of its proper divisors (3291079302649).

12021212111111 is a wasteful number, since it uses less digits than its factorization.

12021212111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5316767894.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12021212111111 its reverse (11111121212021), we get a palindrome (23132333323132).

The spelling of 12021212111111 in words is "twelve trillion, twenty-one billion, two hundred twelve million, one hundred eleven thousand, one hundred eleven".