21554106080 has 48 divisors (see below), whose sum is σ = 54838625184. Its totient is φ = 7958438400.

The previous prime is 21554106031. The next prime is 21554106139. The reversal of 21554106080 is 8060145512.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5179196 + ... + 5183355.

It is an arithmetic number, because the mean of its divisors is an integer number (1142471358).

Almost surely, 2^21554106080 is an apocalyptic number.

21554106080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21554106080 is an abundant number, since it is smaller than the sum of its proper divisors (33284519104).

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

21554106080 is a wasteful number, since it uses less digits than its factorization.

21554106080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10362579 (or 10362571 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The spelling of 21554106080 in words is "twenty-one billion, five hundred fifty-four million, one hundred six thousand, eighty".