21243010012 has 24 divisors (see below), whose sum is σ = 42493280256. Its totient is φ = 9102591408.

The previous prime is 21243009989. The next prime is 21243010037. The reversal of 21243010012 is 21001034212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110253 + ... + 233755.

It is an arithmetic number, because the mean of its divisors is an integer number (1770553344).

Almost surely, 2^21243010012 is an apocalyptic number.

It is an amenable number.

21243010012 is an abundant number, since it is smaller than the sum of its proper divisors (21250270244).

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

21243010012 is a wasteful number, since it uses less digits than its factorization.

21243010012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129657 (or 129655 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21243010012 its reverse (21001034212), we get a palindrome (42244044224).

The spelling of 21243010012 in words is "twenty-one billion, two hundred forty-three million, ten thousand, twelve".