21553884117 has 24 divisors (see below), whose sum is σ = 31868408000. Its totient is φ = 14030247168.

The previous prime is 21553884109. The next prime is 21553884179. The reversal of 21553884117 is 71148835512.

21553884117 is a `hidden beast` number, since 2 + 1 + 553 + 8 + 84 + 1 + 17 = 666.

It is not a de Polignac number, because 21553884117 - 2³ = 21553884109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21553884917) by changing a digit.

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, 1369509 + ... + 1385157.

Almost surely, 2^21553884117 is an apocalyptic number.

It is an amenable number.

21553884117 is a deficient number, since it is larger than the sum of its proper divisors (10314523883).

21553884117 is a wasteful number, since it uses less digits than its factorization.

21553884117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19257 (or 19254 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The spelling of 21553884117 in words is "twenty-one billion, five hundred fifty-three million, eight hundred eighty-four thousand, one hundred seventeen".