13505314221 has 32 divisors (see below), whose sum is σ = 22878777600. Its totient is φ = 7713057600.

The previous prime is 13505314183. The next prime is 13505314223. The reversal of 13505314221 is 12241350531.

13505314221 is a `hidden beast` number, since 13 + 505 + 3 + 142 + 2 + 1 = 666.

It is not a de Polignac number, because 13505314221 - 2¹¹ = 13505312173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13505314223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 340495 + ... + 378083.

It is an arithmetic number, because the mean of its divisors is an integer number (714961800).

Almost surely, 2^13505314221 is an apocalyptic number.

It is an amenable number.

13505314221 is a deficient number, since it is larger than the sum of its proper divisors (9373463379).

13505314221 is a wasteful number, since it uses less digits than its factorization.

13505314221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39506 (or 39500 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 13505314221 its reverse (12241350531), we get a palindrome (25746664752).

The spelling of 13505314221 in words is "thirteen billion, five hundred five million, three hundred fourteen thousand, two hundred twenty-one".