21305730012 has 96 divisors (see below), whose sum is σ = 61177213440. Its totient is φ = 5632143360.

The previous prime is 21305730007. The next prime is 21305730031. The reversal of 21305730012 is 21003750312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42189 + ... + 210692.

It is an arithmetic number, because the mean of its divisors is an integer number (637262640).

Almost surely, 2^21305730012 is an apocalyptic number.

It is an amenable number.

21305730012 is an abundant number, since it is smaller than the sum of its proper divisors (39871483428).

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

21305730012 is a wasteful number, since it uses less digits than its factorization.

21305730012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252971 (or 252969 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The spelling of 21305730012 in words is "twenty-one billion, three hundred five million, seven hundred thirty thousand, twelve".