21424246212 has 24 divisors (see below), whose sum is σ = 51152465056. Its totient is φ = 6975335808.

The previous prime is 21424246177. The next prime is 21424246253. The reversal of 21424246212 is 21264242412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21424246212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20759413 + ... + 20760444.

Almost surely, 2^21424246212 is an apocalyptic number.

It is an amenable number.

21424246212 is an abundant number, since it is smaller than the sum of its proper divisors (29728218844).

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

21424246212 is a wasteful number, since it uses less digits than its factorization.

21424246212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41519907 (or 41519905 counting only the distinct ones).

The product of its digits is 12288, while the sum is 30.

Adding to 21424246212 its reverse (21264242412), we get a palindrome (42688488624).

The spelling of 21424246212 in words is "twenty-one billion, four hundred twenty-four million, two hundred forty-six thousand, two hundred twelve".