212242422 has 72 divisors (see below), whose sum is σ = 505239336. Its totient is φ = 59265024.

The previous prime is 212242403. The next prime is 212242439. The reversal of 212242422 is 224242212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 825718 + ... + 825974.

It is an arithmetic number, because the mean of its divisors is an integer number (7017213).

Almost surely, 2^212242422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212242422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252619668).

212242422 is an abundant number, since it is smaller than the sum of its proper divisors (292996914).

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

212242422 is a wasteful number, since it uses less digits than its factorization.

212242422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 322 counting only the distinct ones).

The product of its digits is 1024, while the sum is 21.

The square root of 212242422 is about 14568.5422057253. The cubic root of 212242422 is about 596.5003886645.

Adding to 212242422 its reverse (224242212), we get a palindrome (436484634).

It can be divided in two parts, 2122 and 42422, that added together give a palindrome (44544).

The spelling of 212242422 in words is "two hundred twelve million, two hundred forty-two thousand, four hundred twenty-two".