21224554550 has 48 divisors (see below), whose sum is σ = 40774247424. Its totient is φ = 8211300000.

The previous prime is 21224554517. The next prime is 21224554573. The reversal of 21224554550 is 5545542212.

It is a self number, because there is not a number n which added to its sum of digits gives 21224554550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4199525 + ... + 4204575.

It is an arithmetic number, because the mean of its divisors is an integer number (849463488).

Almost surely, 2^21224554550 is an apocalyptic number.

21224554550 is a deficient number, since it is larger than the sum of its proper divisors (19549692874).

21224554550 is a wasteful number, since it uses less digits than its factorization.

21224554550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7805 (or 7800 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 35.

The spelling of 21224554550 in words is "twenty-one billion, two hundred twenty-four million, five hundred fifty-four thousand, five hundred fifty".