1216342436121 has 12 divisors (see below), whose sum is σ = 1764678897072. Its totient is φ = 807322731576.

The previous prime is 1216342436093. The next prime is 1216342436123.

1216342436121 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 34 + 2 + 4 + 3 + 612 + 1 = 666.

1216342436121 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1216342436121 - 2¹³ = 1216342427929 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1216342436123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 297683331 + ... + 297687416.

It is an arithmetic number, because the mean of its divisors is an integer number (147056574756).

Almost surely, 2^{1216342436121} is an apocalyptic number.

It is an amenable number.

1216342436121 is a deficient number, since it is larger than the sum of its proper divisors (548336460951).

1216342436121 is a wasteful number, since it uses less digits than its factorization.

1216342436121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595370980 (or 595370977 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The spelling of 1216342436121 in words is "one trillion, two hundred sixteen billion, three hundred forty-two million, four hundred thirty-six thousand, one hundred twenty-one".