216211212 has 36 divisors (see below), whose sum is σ = 624610896. Its totient is φ = 61774560.

The previous prime is 216211199. The next prime is 216211213. The reversal of 216211212 is 212112612.

216211212 is a `hidden beast` number, since 21 + 621 + 1 + 21 + 2 = 666.

216211212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (216211213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 428739 + ... + 429242.

Almost surely, 2^216211212 is an apocalyptic number.

It is an amenable number.

216211212 is an abundant number, since it is smaller than the sum of its proper divisors (408399684).

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

216211212 is a wasteful number, since it uses less digits than its factorization.

216211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857998 (or 857993 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 216211212 is about 14704.1222791434. The cubic root of 216211212 is about 600.1955029574.

Adding to 216211212 its reverse (212112612), we get a palindrome (428323824).

The spelling of 216211212 in words is "two hundred sixteen million, two hundred eleven thousand, two hundred twelve".