121224216 has 16 divisors (see below), whose sum is σ = 303060600. Its totient is φ = 40408064.

The previous prime is 121224133. The next prime is 121224217. The reversal of 121224216 is 612422121.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 121224192 and 121224201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121224217) 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, 2525481 + ... + 2525528.

Almost surely, 2^121224216 is an apocalyptic number.

It is an amenable number.

121224216 is an abundant number, since it is smaller than the sum of its proper divisors (181836384).

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

121224216 is a wasteful number, since it uses less digits than its factorization.

121224216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5051018 (or 5051014 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 121224216 is about 11010.1869193942. The cubic root of 121224216 is about 494.9140632367.

Adding to 121224216 its reverse (612422121), we get a palindrome (733646337).

The spelling of 121224216 in words is "one hundred twenty-one million, two hundred twenty-four thousand, two hundred sixteen".