21130241212 has 12 divisors (see below), whose sum is σ = 36979215336. Its totient is φ = 10564751120.

The previous prime is 21130241191. The next prime is 21130241213. The reversal of 21130241212 is 21214203112.

It is a self number, because there is not a number n which added to its sum of digits gives 21130241212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130241213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66762 + ... + 216142.

It is an arithmetic number, because the mean of its divisors is an integer number (3081601278).

Almost surely, 2^21130241212 is an apocalyptic number.

It is an amenable number.

21130241212 is a deficient number, since it is larger than the sum of its proper divisors (15848974124).

21130241212 is a wasteful number, since it uses less digits than its factorization.

21130241212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184748 (or 184746 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21130241212 its reverse (21214203112), we get a palindrome (42344444324).

The spelling of 21130241212 in words is "twenty-one billion, one hundred thirty million, two hundred forty-one thousand, two hundred twelve".