21887852907872 has 96 divisors (see below), whose sum is σ = 49732304832000. Its totient is φ = 9288359958528.

The previous prime is 21887852907773. The next prime is 21887852907953. The reversal of 21887852907872 is 27870925878812.

It is a super-2 number, since 2×21887852907872² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21887852907872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25368629 + ... + 26217227.

It is an arithmetic number, because the mean of its divisors is an integer number (518044842000).

Almost surely, 2^{21887852907872} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21887852907872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24866152416000).

21887852907872 is an abundant number, since it is smaller than the sum of its proper divisors (27844451924128).

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

21887852907872 is a wasteful number, since it uses less digits than its factorization.

21887852907872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849748 (or 849740 counting only the distinct ones).

The product of its (nonzero) digits is 505774080, while the sum is 74.

The spelling of 21887852907872 in words is "twenty-one trillion, eight hundred eighty-seven billion, eight hundred fifty-two million, nine hundred seven thousand, eight hundred seventy-two".