212212242 has 96 divisors (see below), whose sum is σ = 522849600. Its totient is φ = 61637760.

The previous prime is 212212219. The next prime is 212212243. The reversal of 212212242 is 242212212.

212212242 is a `hidden beast` number, since 212 + 212 + 242 = 666.

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

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (212212243) 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 47 ways as a sum of consecutive naturals, for example, 607884 + ... + 608232.

It is an arithmetic number, because the mean of its divisors is an integer number (5446350).

Almost surely, 2^212212242 is an apocalyptic number.

212212242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 212212242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261424800).

212212242 is an abundant number, since it is smaller than the sum of its proper divisors (310637358).

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

212212242 is a wasteful number, since it uses less digits than its factorization.

212212242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 485 counting only the distinct ones).

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

The square root of 212212242 is about 14567.5063754920. The cubic root of 212212242 is about 596.4721140231.

Adding to 212212242 its reverse (242212212), we get a palindrome (454424454).

The spelling of 212212242 in words is "two hundred twelve million, two hundred twelve thousand, two hundred forty-two".