1216513343044 has 12 divisors (see below), whose sum is σ = 2129714351100. Its totient is φ = 608023528448.

The previous prime is 1216513343041. The next prime is 1216513343051. The reversal of 1216513343044 is 4403433156121.

It can be written as a sum of positive squares in 2 ways, for example, as 533060612100 + 683452730944 = 730110^2 + 826712^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1216513342994 and 1216513343012.

It is not an unprimeable number, because it can be changed into a prime (1216513343041) 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, 58274029 + ... + 58294900.

It is an arithmetic number, because the mean of its divisors is an integer number (177476195925).

Almost surely, 2^{1216513343044} is an apocalyptic number.

It is an amenable number.

1216513343044 is a deficient number, since it is larger than the sum of its proper divisors (913201008056).

1216513343044 is a wasteful number, since it uses less digits than its factorization.

1216513343044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116571542 (or 116571540 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

Adding to 1216513343044 its reverse (4403433156121), we get a palindrome (5619946499165).

The spelling of 1216513343044 in words is "one trillion, two hundred sixteen billion, five hundred thirteen million, three hundred forty-three thousand, forty-four".