12011212101021 has 32 divisors (see below), whose sum is σ = 18630047723520. Its totient is φ = 6741044541504.

The previous prime is 12011212101013. The next prime is 12011212101089. The reversal of 12011212101021 is 12010121211021.

It is a happy number.

It is not a de Polignac number, because 12011212101021 - 2³ = 12011212101013 is a prime.

It is a super-2 number, since 2×12011212101021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011212121021) 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 31 ways as a sum of consecutive naturals, for example, 3080485 + ... + 5788938.

It is an arithmetic number, because the mean of its divisors is an integer number (582188991360).

Almost surely, 2^{12011212101021} is an apocalyptic number.

It is an amenable number.

12011212101021 is a deficient number, since it is larger than the sum of its proper divisors (6618835622499).

12011212101021 is a wasteful number, since it uses less digits than its factorization.

12011212101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8870585.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 12011212101021 its reverse (12010121211021), we get a palindrome (24021333312042).

The spelling of 12011212101021 in words is "twelve trillion, eleven billion, two hundred twelve million, one hundred one thousand, twenty-one".