216646212 has 48 divisors (see below), whose sum is σ = 522510912. Its totient is φ = 69820800.

The previous prime is 216646207. The next prime is 216646231. The reversal of 216646212 is 212646612.

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

It is a self number, because there is not a number n which added to its sum of digits gives 216646212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50038 + ... + 54194.

It is an arithmetic number, because the mean of its divisors is an integer number (10885644).

Almost surely, 2^216646212 is an apocalyptic number.

It is an amenable number.

216646212 is an abundant number, since it is smaller than the sum of its proper divisors (305864700).

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

216646212 is a wasteful number, since it uses less digits than its factorization.

216646212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4308 (or 4306 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 216646212 is about 14718.9066170011. The cubic root of 216646212 is about 600.5977487408.

The spelling of 216646212 in words is "two hundred sixteen million, six hundred forty-six thousand, two hundred twelve".