21212342224 has 20 divisors (see below), whose sum is σ = 42424685440. Its totient is φ = 10264036320.

The previous prime is 21212342201. The next prime is 21212342243. The reversal of 21212342224 is 42224321212.

21212342224 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 21382914 + ... + 21383905.

It is an arithmetic number, because the mean of its divisors is an integer number (2121234272).

Almost surely, 2^21212342224 is an apocalyptic number.

It is an amenable number.

21212342224 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21212342224 is a wasteful number, since it uses less digits than its factorization.

21212342224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42766858 (or 42766852 counting only the distinct ones).

The product of its digits is 3072, while the sum is 25.

Adding to 21212342224 its reverse (42224321212), we get a palindrome (63436663436).

The spelling of 21212342224 in words is "twenty-one billion, two hundred twelve million, three hundred forty-two thousand, two hundred twenty-four".