21243421412 has 12 divisors (see below), whose sum is σ = 37180197936. Its totient is φ = 10620507720.

The previous prime is 21243421399. The next prime is 21243421453. The reversal of 21243421412 is 21412434212.

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, 260414 + ... + 332117.

It is an arithmetic number, because the mean of its divisors is an integer number (3098349828).

Almost surely, 2^21243421412 is an apocalyptic number.

It is an amenable number.

21243421412 is a deficient number, since it is larger than the sum of its proper divisors (15936776524).

21243421412 is a wasteful number, since it uses less digits than its factorization.

21243421412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601498 (or 601496 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

Adding to 21243421412 its reverse (21412434212), we get a palindrome (42655855624).

The spelling of 21243421412 in words is "twenty-one billion, two hundred forty-three million, four hundred twenty-one thousand, four hundred twelve".