1216091112 has 16 divisors (see below), whose sum is σ = 3040227840. Its totient is φ = 405363696.

The previous prime is 1216090979. The next prime is 1216091117. The reversal of 1216091112 is 2111906121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 50670463 = 1216091112 / (1 + 2 + 1 + 6 + 0 + 9 + 1 + 1 + 1 + 2).

It is not an unprimeable number, because it can be changed into a prime (1216091117) 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, 25335208 + ... + 25335255.

It is an arithmetic number, because the mean of its divisors is an integer number (190014240).

Almost surely, 2^1216091112 is an apocalyptic number.

1216091112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1216091112 is an abundant number, since it is smaller than the sum of its proper divisors (1824136728).

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

1216091112 is a wasteful number, since it uses less digits than its factorization.

1216091112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50670472 (or 50670468 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 24.

The square root of 1216091112 is about 34872.4979317513. The cubic root of 1216091112 is about 1067.3873170917.

Adding to 1216091112 its reverse (2111906121), we get a palindrome (3327997233).

The spelling of 1216091112 in words is "one billion, two hundred sixteen million, ninety-one thousand, one hundred twelve".