212304505 has 24 divisors (see below), whose sum is σ = 306589320. Its totient is φ = 140555520.

The previous prime is 212304451. The next prime is 212304509. The reversal of 212304505 is 505403212.

212304505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2547216 + 209757289 = 1596^2 + 14483^2 .

It is not a de Polignac number, because 212304505 - 2¹¹ = 212302457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212304509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7836 + ... + 22045.

It is an arithmetic number, because the mean of its divisors is an integer number (12774555).

Almost surely, 2^212304505 is an apocalyptic number.

It is an amenable number.

212304505 is a deficient number, since it is larger than the sum of its proper divisors (94284815).

212304505 is a wasteful number, since it uses less digits than its factorization.

212304505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29929 (or 29922 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 212304505 is about 14570.6727710151. The cubic root of 212304505 is about 596.5585437418.

Adding to 212304505 its reverse (505403212), we get a palindrome (717707717).

The spelling of 212304505 in words is "two hundred twelve million, three hundred four thousand, five hundred five".