21324424212 has 144 divisors (see below), whose sum is σ = 68483064832. Its totient is φ = 5442577920.

The previous prime is 21324424211. The next prime is 21324424229. The reversal of 21324424212 is 21242442312.

It is a happy number.

21324424212 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 442 + 4 + 212 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324424211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3433 + ... + 206544.

Almost surely, 2^21324424212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21324424212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34241532416).

21324424212 is an abundant number, since it is smaller than the sum of its proper divisors (47158640620).

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

21324424212 is a wasteful number, since it uses less digits than its factorization.

21324424212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210038 (or 210033 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

Adding to 21324424212 its reverse (21242442312), we get a palindrome (42566866524).

The spelling of 21324424212 in words is "twenty-one billion, three hundred twenty-four million, four hundred twenty-four thousand, two hundred twelve".