21558110980 has 48 divisors (see below), whose sum is σ = 54462602880. Its totient is φ = 7002332928.

The previous prime is 21558110947. The next prime is 21558110993. The reversal of 21558110980 is 8901185512.

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, 4049617 + ... + 4054936.

It is an arithmetic number, because the mean of its divisors is an integer number (1134637560).

Almost surely, 2^21558110980 is an apocalyptic number.

21558110980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21558110980 is an abundant number, since it is smaller than the sum of its proper divisors (32904491900).

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

21558110980 is a wasteful number, since it uses less digits than its factorization.

21558110980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8104588 (or 8104586 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 40.

The spelling of 21558110980 in words is "twenty-one billion, five hundred fifty-eight million, one hundred ten thousand, nine hundred eighty".