212455 has 4 divisors (see below), whose sum is σ = 254952. Its totient is φ = 169960.

The previous prime is 212453. The next prime is 212461. The reversal of 212455 is 554212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 212455 - 2¹ = 212453 is a prime.

It is a d-powerful number, because it can be written as 2⁷ + 1 + 4 + 2¹⁷ + 5⁵ + 5⁷ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21241 + ... + 21250.

It is an arithmetic number, because the mean of its divisors is an integer number (63738).

2²¹²⁴⁵⁵ is an apocalyptic number.

212455 is a deficient number, since it is larger than the sum of its proper divisors (42497).

212455 is an equidigital number, since it uses as much as digits as its factorization.

212455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42496.

The product of its digits is 400, while the sum is 19.

The square root of 212455 is about 460.9284109273. The cubic root of 212455 is about 59.6699470054.

Adding to 212455 its reverse (554212), we get a palindrome (766667).

The spelling of 212455 in words is "two hundred twelve thousand, four hundred fifty-five".