212005422 has 24 divisors (see below), whose sum is σ = 462856680. Its totient is φ = 70128240.

The previous prime is 212005411. The next prime is 212005429. The reversal of 212005422 is 224500212.

212005422 is a `hidden beast` number, since 2 + 120 + 0 + 542 + 2 = 666.

212005422 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 212005395 and 212005404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212005429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42597 + ... + 47312.

It is an arithmetic number, because the mean of its divisors is an integer number (19285695).

Almost surely, 2^212005422 is an apocalyptic number.

212005422 is an abundant number, since it is smaller than the sum of its proper divisors (250851258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212005422 is a wasteful number, since it uses less digits than its factorization.

212005422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90048 (or 90045 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 212005422 is about 14560.4059696150. The cubic root of 212005422 is about 596.2782790538.

Adding to 212005422 its reverse (224500212), we get a palindrome (436505634).

The spelling of 212005422 in words is "two hundred twelve million, five thousand, four hundred twenty-two".