212412405 has 16 divisors (see below), whose sum is σ = 340341120. Its totient is φ = 113126208.

The previous prime is 212412397. The next prime is 212412413. The reversal of 212412405 is 504214212.

It is an interprime number because it is at equal distance from previous prime (212412397) and next prime (212412413).

It is not a de Polignac number, because 212412405 - 2³ = 212412397 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1336 + ... + 20654.

It is an arithmetic number, because the mean of its divisors is an integer number (21271320).

Almost surely, 2^212412405 is an apocalyptic number.

It is an amenable number.

212412405 is a deficient number, since it is larger than the sum of its proper divisors (127928715).

212412405 is a wasteful number, since it uses less digits than its factorization.

212412405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20060.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 212412405 is about 14574.3749437154. The cubic root of 212412405 is about 596.6595900593.

Adding to 212412405 its reverse (504214212), we get a palindrome (716626617).

The spelling of 212412405 in words is "two hundred twelve million, four hundred twelve thousand, four hundred five".