21242000312 has 32 divisors (see below), whose sum is σ = 42931973280. Its totient is φ = 9794977920.

The previous prime is 21242000287. The next prime is 21242000321. The reversal of 21242000312 is 21300024212.

It is a congruent number.

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, 20237 + ... + 207107.

It is an arithmetic number, because the mean of its divisors is an integer number (1341624165).

Almost surely, 2^21242000312 is an apocalyptic number.

It is an amenable number.

21242000312 is an abundant number, since it is smaller than the sum of its proper divisors (21689972968).

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

21242000312 is a wasteful number, since it uses less digits than its factorization.

21242000312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187983 (or 187979 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21242000312 its reverse (21300024212), we get a palindrome (42542024524).

The spelling of 21242000312 in words is "twenty-one billion, two hundred forty-two million, three hundred twelve", and thus it is an aban number.