212405005 has 8 divisors (see below), whose sum is σ = 255046392. Its totient is φ = 169817088.

The previous prime is 212405003. The next prime is 212405027. The reversal of 212405005 is 500504212.

It can be written as a sum of positive squares in 4 ways, for example, as 29452329 + 182952676 = 5427^2 + 13526^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212405005 - 2¹ = 212405003 is a prime.

It is a super-2 number, since 2×212405005² = 90231772298100050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212405003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4032 + ... + 21001.

It is an arithmetic number, because the mean of its divisors is an integer number (31880799).

Almost surely, 2^212405005 is an apocalyptic number.

It is an amenable number.

212405005 is a deficient number, since it is larger than the sum of its proper divisors (42641387).

212405005 is a wasteful number, since it uses less digits than its factorization.

212405005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26735.

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

The square root of 212405005 is about 14574.1210712688. The cubic root of 212405005 is about 596.6526611917.

Adding to 212405005 its reverse (500504212), we get a palindrome (712909217).

The spelling of 212405005 in words is "two hundred twelve million, four hundred five thousand, five".