12021201212111 has 24 divisors (see below), whose sum is σ = 15080406950880. Its totient is φ = 9380988504576.

The previous prime is 12021201212093. The next prime is 12021201212131. The reversal of 12021201212111 is 11121210212021.

It is a de Polignac number, because none of the positive numbers 2^k-12021201212111 is a prime.

It is a super-2 number, since 2×12021201212111² (a number of 27 digits) contains 22 as substring.

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 12021201212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021201212131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69513806 + ... + 69686523.

It is an arithmetic number, because the mean of its divisors is an integer number (628350289620).

Almost surely, 2^{12021201212111} is an apocalyptic number.

12021201212111 is a deficient number, since it is larger than the sum of its proper divisors (3059205738769).

12021201212111 is a wasteful number, since it uses less digits than its factorization.

12021201212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139200435 (or 139200422 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12021201212111 its reverse (11121210212021), we get a palindrome (23142411424132).

The spelling of 12021201212111 in words is "twelve trillion, twenty-one billion, two hundred one million, two hundred twelve thousand, one hundred eleven".