21407810550 has 48 divisors (see below), whose sum is σ = 60675854592. Its totient is φ = 4893213600.

The previous prime is 21407810539. The next prime is 21407810597. The reversal of 21407810550 is 5501870412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10193146 + ... + 10195245.

It is an arithmetic number, because the mean of its divisors is an integer number (1264080304).

Almost surely, 2^21407810550 is an apocalyptic number.

21407810550 is an abundant number, since it is smaller than the sum of its proper divisors (39268044042).

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

21407810550 is a wasteful number, since it uses less digits than its factorization.

21407810550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20388413 (or 20388408 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 33.

The spelling of 21407810550 in words is "twenty-one billion, four hundred seven million, eight hundred ten thousand, five hundred fifty".