213212 has 12 divisors (see below), whose sum is σ = 376656. Its totient is φ = 105600.

The previous prime is 213209. The next prime is 213217. The reversal of 213212 is 212312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 213193 and 213202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213217) 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, 428 + ... + 780.

It is an arithmetic number, because the mean of its divisors is an integer number (31388).

2²¹³²¹² is an apocalyptic number.

It is an amenable number.

213212 is a deficient number, since it is larger than the sum of its proper divisors (163444).

213212 is a wasteful number, since it uses less digits than its factorization.

213212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508 (or 506 counting only the distinct ones).

The product of its digits is 24, while the sum is 11.

The square root of 213212 is about 461.7488494842. The cubic root of 213212 is about 59.7407331438.

Adding to 213212 its reverse (212312), we get a palindrome (425524).

Subtracting from 213212 its reverse (212312), we obtain a square (900 = 30²).

The spelling of 213212 in words is "two hundred thirteen thousand, two hundred twelve".