216212 has 12 divisors (see below), whose sum is σ = 381696. Its totient is φ = 107160.

The previous prime is 216211. The next prime is 216217. The reversal of 216212 is 212612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216211) 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, 623 + ... + 905.

It is an arithmetic number, because the mean of its divisors is an integer number (31808).

2²¹⁶²¹² is an apocalyptic number.

It is an amenable number.

216212 is a deficient number, since it is larger than the sum of its proper divisors (165484).

216212 is a wasteful number, since it uses less digits than its factorization.

216212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 476 counting only the distinct ones).

The product of its digits is 48, while the sum is 14.

The square root of 216212 is about 464.9860212953. The cubic root of 216212 is about 60.0196232111.

Adding to 216212 its reverse (212612), we get a palindrome (428824).

Subtracting from 216212 its reverse (212612), we obtain a square (3600 = 60²).

The spelling of 216212 in words is "two hundred sixteen thousand, two hundred twelve".