21828521712 has 20 divisors (see below), whose sum is σ = 56390347880. Its totient is φ = 7276173888.

The previous prime is 21828521707. The next prime is 21828521719. The reversal of 21828521712 is 21712582812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21828521719) 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, 227380387 + ... + 227380482.

It is an arithmetic number, because the mean of its divisors is an integer number (2819517394).

Almost surely, 2^21828521712 is an apocalyptic number.

It is an amenable number.

21828521712 is an abundant number, since it is smaller than the sum of its proper divisors (34561826168).

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

21828521712 is a wasteful number, since it uses less digits than its factorization.

21828521712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454760880 (or 454760874 counting only the distinct ones).

The product of its digits is 35840, while the sum is 39.

The spelling of 21828521712 in words is "twenty-one billion, eight hundred twenty-eight million, five hundred twenty-one thousand, seven hundred twelve".