1216111334 has 4 divisors (see below), whose sum is σ = 1824167004. Its totient is φ = 608055666.

The previous prime is 1216111333. The next prime is 1216111339. The reversal of 1216111334 is 4331116121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4331116121 = 509 ⋅8509069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216111333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304027832 + ... + 304027835.

It is an arithmetic number, because the mean of its divisors is an integer number (456041751).

Almost surely, 2^1216111334 is an apocalyptic number.

1216111334 is a deficient number, since it is larger than the sum of its proper divisors (608055670).

1216111334 is an equidigital number, since it uses as much as digits as its factorization.

1216111334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608055669.

The product of its digits is 432, while the sum is 23.

The square root of 1216111334 is about 34872.7878724945. The cubic root of 1216111334 is about 1067.3932334759.

Adding to 1216111334 its reverse (4331116121), we get a palindrome (5547227455).

The spelling of 1216111334 in words is "one billion, two hundred sixteen million, one hundred eleven thousand, three hundred thirty-four".