1216216424305 has 8 divisors (see below), whose sum is σ = 1460307749544. Its totient is φ = 972407779200.

The previous prime is 1216216424261. The next prime is 1216216424317. The reversal of 1216216424305 is 5034246126121.

It can be written as a sum of positive squares in 4 ways, for example, as 351478236736 + 864738187569 = 592856^2 + 929913^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1216216424305 - 2²³ = 1216208035697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70660566 + ... + 70677775.

It is an arithmetic number, because the mean of its divisors is an integer number (182538468693).

Almost surely, 2^{1216216424305} is an apocalyptic number.

It is an amenable number.

1216216424305 is a deficient number, since it is larger than the sum of its proper divisors (244091325239).

1216216424305 is a wasteful number, since it uses less digits than its factorization.

1216216424305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141340067.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 1216216424305 in words is "one trillion, two hundred sixteen billion, two hundred sixteen million, four hundred twenty-four thousand, three hundred five".