212112405 has 32 divisors (see below), whose sum is σ = 378241920. Its totient is φ = 112780800.

The previous prime is 212112403. The next prime is 212112427. The reversal of 212112405 is 504211212.

It is not a de Polignac number, because 212112405 - 2¹ = 212112403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212112401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45430 + ... + 49880.

It is an arithmetic number, because the mean of its divisors is an integer number (11820060).

Almost surely, 2^212112405 is an apocalyptic number.

It is an amenable number.

212112405 is a deficient number, since it is larger than the sum of its proper divisors (166129515).

212112405 is a wasteful number, since it uses less digits than its factorization.

212112405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4818 (or 4812 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 212112405 is about 14564.0792705890. The cubic root of 212112405 is about 596.3785609417.

Adding to 212112405 its reverse (504211212), we get a palindrome (716323617).

The spelling of 212112405 in words is "two hundred twelve million, one hundred twelve thousand, four hundred five".