216421156 has 12 divisors (see below), whose sum is σ = 432842368. Its totient is φ = 92751912.

The previous prime is 216421151. The next prime is 216421187. The reversal of 216421156 is 651124612.

216421156 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 7729327 = 216421156 / (2 + 1 + 6 + 4 + 2 + 1 + 1 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (216421151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3864636 + ... + 3864691.

Almost surely, 2^216421156 is an apocalyptic number.

It is an amenable number.

216421156 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216421156 is a wasteful number, since it uses less digits than its factorization.

216421156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7729338 (or 7729336 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 216421156 is about 14711.2594974054. The cubic root of 216421156 is about 600.3897060864.

Adding to 216421156 its reverse (651124612), we get a palindrome (867545768).

The spelling of 216421156 in words is "two hundred sixteen million, four hundred twenty-one thousand, one hundred fifty-six".