13500550221 has 16 divisors (see below), whose sum is σ = 19062096768.
Its totient is φ = 8469824000.
The previous prime is 13500550181. The next prime is 13500550223. The reversal of 13500550221 is 12205500531.
It is a happy number.
It is a cyclic number.
It is not a de Polignac number, because 13500550221 - 218 = 13500288077 is a prime.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 13500550191 and 13500550200.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (13500550223) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 567241 + ... + 590561.
It is an arithmetic number, because the mean of its divisors is an integer number (1191381048).
Almost surely, 213500550221 is an apocalyptic number.
It is an amenable number.
13500550221 is a deficient number, since it is larger than the sum of its proper divisors (5561546547).
13500550221 is a wasteful number, since it uses less digits than its factorization.
13500550221 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 34692.
The product of its (nonzero) digits is 1500, while the sum is 24.
The spelling of 13500550221 in words is "thirteen billion, five hundred million, five hundred fifty thousand, two hundred twenty-one".