21887886540 has 96 divisors (see below), whose sum is σ = 66026632896. Its totient is φ = 5385646080.

The previous prime is 21887886533. The next prime is 21887886569. The reversal of 21887886540 is 4568878812.

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, 2986080 + ... + 2993400.

It is an arithmetic number, because the mean of its divisors is an integer number (687777426).

Almost surely, 2^21887886540 is an apocalyptic number.

21887886540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21887886540 is an abundant number, since it is smaller than the sum of its proper divisors (44138746356).

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

21887886540 is a wasteful number, since it uses less digits than its factorization.

21887886540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11179 (or 11177 counting only the distinct ones).

The product of its (nonzero) digits is 6881280, while the sum is 57.

The spelling of 21887886540 in words is "twenty-one billion, eight hundred eighty-seven million, eight hundred eighty-six thousand, five hundred forty".