212444005 has 4 divisors (see below), whose sum is σ = 254932812. Its totient is φ = 169955200.

The previous prime is 212444003. The next prime is 212444009. The reversal of 212444005 is 500444212.

It is a happy number.

212444005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 137898049 + 74545956 = 11743^2 + 8634^2 .

It is not a de Polignac number, because 212444005 - 2¹ = 212444003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212444003) 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, 21244396 + ... + 21244405.

It is an arithmetic number, because the mean of its divisors is an integer number (63733203).

Almost surely, 2^212444005 is an apocalyptic number.

It is an amenable number.

212444005 is a deficient number, since it is larger than the sum of its proper divisors (42488807).

212444005 is an equidigital number, since it uses as much as digits as its factorization.

212444005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42488806.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 212444005 is about 14575.4589979184. The cubic root of 212444005 is about 596.6891763855.

Adding to 212444005 its reverse (500444212), we get a palindrome (712888217).

The spelling of 212444005 in words is "two hundred twelve million, four hundred forty-four thousand, five".