212104005 has 16 divisors (see below), whose sum is σ = 339751104. Its totient is φ = 112993920.

The previous prime is 212103989. The next prime is 212104007. The reversal of 212104005 is 500401212.

It is not a de Polignac number, because 212104005 - 2⁴ = 212103989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212104007) 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 15 ways as a sum of consecutive naturals, for example, 6510 + ... + 21600.

It is an arithmetic number, because the mean of its divisors is an integer number (21234444).

Almost surely, 2^212104005 is an apocalyptic number.

It is an amenable number.

212104005 is a deficient number, since it is larger than the sum of its proper divisors (127647099).

212104005 is a wasteful number, since it uses less digits than its factorization.

212104005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16036.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 212104005 is about 14563.7908869909. The cubic root of 212104005 is about 596.3706883139.

Adding to 212104005 its reverse (500401212), we get a palindrome (712505217).

The spelling of 212104005 in words is "two hundred twelve million, one hundred four thousand, five".