212156 has 12 divisors (see below), whose sum is σ = 424368. Its totient is φ = 90912.

The previous prime is 212141. The next prime is 212161. The reversal of 212156 is 651212.

212156 is an admirable number.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

212156 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3761 + ... + 3816.

It is an arithmetic number, because the mean of its divisors is an integer number (35364).

2²¹²¹⁵⁶ is an apocalyptic number.

It is an amenable number.

212156 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

212156 is a wasteful number, since it uses less digits than its factorization.

212156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7588 (or 7586 counting only the distinct ones).

The product of its digits is 120, while the sum is 17.

The square root of 212156 is about 460.6039513508. The cubic root of 212156 is about 59.6419415605.

Adding to 212156 its reverse (651212), we get a palindrome (863368).

The spelling of 212156 in words is "two hundred twelve thousand, one hundred fifty-six".