1121216172 has 12 divisors (see below), whose sum is σ = 2616171096. Its totient is φ = 373738720.

The previous prime is 1121216149. The next prime is 1121216179. The reversal of 1121216172 is 2716121211.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1121216179) 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, 46717329 + ... + 46717352.

It is an arithmetic number, because the mean of its divisors is an integer number (218014258).

Almost surely, 2^1121216172 is an apocalyptic number.

1121216172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1121216172 is an abundant number, since it is smaller than the sum of its proper divisors (1494954924).

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

1121216172 is a wasteful number, since it uses less digits than its factorization.

1121216172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93434688 (or 93434686 counting only the distinct ones).

The product of its digits is 336, while the sum is 24.

The square root of 1121216172 is about 33484.5661760758. The cubic root of 1121216172 is about 1038.8745752259.

Adding to 1121216172 its reverse (2716121211), we get a palindrome (3837337383).

The spelling of 1121216172 in words is "one billion, one hundred twenty-one million, two hundred sixteen thousand, one hundred seventy-two".