1216634105204 has 12 divisors (see below), whose sum is σ = 2433268210464. Its totient is φ = 521414616504.

The previous prime is 1216634105153. The next prime is 1216634105213. The reversal of 1216634105204 is 4025014366121.

1216634105204 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 21725608994 + ... + 21725609049.

It is an arithmetic number, because the mean of its divisors is an integer number (202772350872).

Almost surely, 2^{1216634105204} is an apocalyptic number.

1216634105204 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1216634105204 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216634105204 is a wasteful number, since it uses less digits than its factorization.

1216634105204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43451218054 (or 43451218052 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 1216634105204 in words is "one trillion, two hundred sixteen billion, six hundred thirty-four million, one hundred five thousand, two hundred four".