212405205 has 16 divisors (see below), whose sum is σ = 342296640. Its totient is φ = 112466688.

The previous prime is 212405201. The next prime is 212405213. The reversal of 212405205 is 502504212.

It is a happy number.

212405205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212405205 - 2² = 212405201 is a prime.

It is a super-2 number, since 2×212405205² = 90231942222184050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212405201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48852 + ... + 53021.

It is an arithmetic number, because the mean of its divisors is an integer number (21393540).

Almost surely, 2^212405205 is an apocalyptic number.

It is an amenable number.

212405205 is a deficient number, since it is larger than the sum of its proper divisors (129891435).

212405205 is a wasteful number, since it uses less digits than its factorization.

212405205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102020.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 212405205 is about 14574.1279327444. The cubic root of 212405205 is about 596.6528484605.

Adding to 212405205 its reverse (502504212), we get a palindrome (714909417).

The spelling of 212405205 in words is "two hundred twelve million, four hundred five thousand, two hundred five".