21550055104 has 28 divisors (see below), whose sum is σ = 42768774000. Its totient is φ = 10773671168.

The previous prime is 21550055081. The next prime is 21550055119. The reversal of 21550055104 is 40155005512.

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 3 ways as a sum of consecutive naturals, for example, 661797 + ... + 693595.

Almost surely, 2^21550055104 is an apocalyptic number.

It is an amenable number.

21550055104 is a deficient number, since it is larger than the sum of its proper divisors (21218718896).

21550055104 is a wasteful number, since it uses less digits than its factorization.

21550055104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42400 (or 42390 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 28.

The spelling of 21550055104 in words is "twenty-one billion, five hundred fifty million, fifty-five thousand, one hundred four".