212506 has 16 divisors (see below), whose sum is σ = 373824. Its totient is φ = 88704.

The previous prime is 212501. The next prime is 212507. The reversal of 212506 is 605212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 212506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426 + ... + 778.

It is an arithmetic number, because the mean of its divisors is an integer number (23364).

2²¹²⁵⁰⁶ is an apocalyptic number.

212506 is a deficient number, since it is larger than the sum of its proper divisors (161318).

212506 is a wasteful number, since it uses less digits than its factorization.

212506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 212506 is about 460.9837307324. The cubic root of 212506 is about 59.6747212302.

Adding to 212506 its reverse (605212), we get a palindrome (817718).

The spelling of 212506 in words is "two hundred twelve thousand, five hundred six".