1216929144181 has 4 divisors (see below), whose sum is σ = 1223727631200. Its totient is φ = 1210130657164.

The previous prime is 1216929144163. The next prime is 1216929144191. The reversal of 1216929144181 is 1814419296121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1216929144181 - 2²⁷ = 1216794926453 is a prime.

It is a super-2 number, since 2×1216929144181² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216929144191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3399243241 + ... + 3399243598.

It is an arithmetic number, because the mean of its divisors is an integer number (305931907800).

Almost surely, 2^{1216929144181} is an apocalyptic number.

It is an amenable number.

1216929144181 is a deficient number, since it is larger than the sum of its proper divisors (6798487019).

1216929144181 is an equidigital number, since it uses as much as digits as its factorization.

1216929144181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6798487018.

The product of its digits is 248832, while the sum is 49.

The spelling of 1216929144181 in words is "one trillion, two hundred sixteen billion, nine hundred twenty-nine million, one hundred forty-four thousand, one hundred eighty-one".