1216340340436 has 12 divisors (see below), whose sum is σ = 2292333718612. Its totient is φ = 561387849408.

The previous prime is 1216340340349. The next prime is 1216340340539. The reversal of 1216340340436 is 6340430436121.

It can be written as a sum of positive squares in 2 ways, for example, as 821760380100 + 394579960336 = 906510^2 + 628156^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1216340340395 and 1216340340404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11695580145 + ... + 11695580248.

Almost surely, 2^{1216340340436} is an apocalyptic number.

It is an amenable number.

1216340340436 is a deficient number, since it is larger than the sum of its proper divisors (1075993378176).

1216340340436 is a wasteful number, since it uses less digits than its factorization.

1216340340436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23391160410 (or 23391160408 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 37.

Adding to 1216340340436 its reverse (6340430436121), we get a palindrome (7556770776557).

The spelling of 1216340340436 in words is "one trillion, two hundred sixteen billion, three hundred forty million, three hundred forty thousand, four hundred thirty-six".