21871488886 has 24 divisors (see below), whose sum is σ = 37394739720. Its totient is φ = 9563239296.

The previous prime is 21871488857. The next prime is 21871488913. The reversal of 21871488886 is 68888417812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1696435 + ... + 1709278.

It is an arithmetic number, because the mean of its divisors is an integer number (1558114155).

Almost surely, 2^21871488886 is an apocalyptic number.

21871488886 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21871488886 is a deficient number, since it is larger than the sum of its proper divisors (15523250834).

21871488886 is a wasteful number, since it uses less digits than its factorization.

21871488886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3405760 (or 3405747 counting only the distinct ones).

The product of its digits is 11010048, while the sum is 61.

The spelling of 21871488886 in words is "twenty-one billion, eight hundred seventy-one million, four hundred eighty-eight thousand, eight hundred eighty-six".