1217518345121 has 16 divisors (see below), whose sum is σ = 1321848213504. Its totient is φ = 1114718117184.

The previous prime is 1217518345097. The next prime is 1217518345151. The reversal of 1217518345121 is 1215438157121.

It is a cyclic number.

It is not a de Polignac number, because 1217518345121 - 2²⁶ = 1217451236257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1217518345151) 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, 6255551 + ... + 6447243.

It is an arithmetic number, because the mean of its divisors is an integer number (82615513344).

Almost surely, 2^{1217518345121} is an apocalyptic number.

It is an amenable number.

1217518345121 is a deficient number, since it is larger than the sum of its proper divisors (104329868383).

1217518345121 is a wasteful number, since it uses less digits than its factorization.

1217518345121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195680.

The product of its digits is 67200, while the sum is 41.

The spelling of 1217518345121 in words is "one trillion, two hundred seventeen billion, five hundred eighteen million, three hundred forty-five thousand, one hundred twenty-one".