212122422 has 128 divisors (see below), whose sum is σ = 528768000. Its totient is φ = 62726400.

The previous prime is 212122381. The next prime is 212122433. The reversal of 212122422 is 224221212.

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 = 212122395 and 212122404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2100172 + ... + 2100272.

It is an arithmetic number, because the mean of its divisors is an integer number (4131000).

Almost surely, 2^212122422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212122422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264384000).

212122422 is an abundant number, since it is smaller than the sum of its proper divisors (316645578).

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

212122422 is a wasteful number, since it uses less digits than its factorization.

212122422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 237 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 212122422 is about 14564.4231605649. The cubic root of 212122422 is about 596.3879487786.

Adding to 212122422 its reverse (224221212), we get a palindrome (436343634).

The spelling of 212122422 in words is "two hundred twelve million, one hundred twenty-two thousand, four hundred twenty-two".