1216805434242 has 32 divisors (see below), whose sum is σ = 2435982850752. Its totient is φ = 405206613504.

The previous prime is 1216805434223. The next prime is 1216805434259. The reversal of 1216805434242 is 2424345086121.

It is a super-2 number, since 2×1216805434242² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1216805434194 and 1216805434203.

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 15 ways as a sum of consecutive naturals, for example, 47247213 + ... + 47272959.

It is an arithmetic number, because the mean of its divisors is an integer number (76124464086).

Almost surely, 2^{1216805434242} is an apocalyptic number.

1216805434242 is an abundant number, since it is smaller than the sum of its proper divisors (1219177416510).

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

1216805434242 is a wasteful number, since it uses less digits than its factorization.

1216805434242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33122.

The product of its (nonzero) digits is 368640, while the sum is 42.

The spelling of 1216805434242 in words is "one trillion, two hundred sixteen billion, eight hundred five million, four hundred thirty-four thousand, two hundred forty-two".