13505250321 has 12 divisors (see below), whose sum is σ = 19513486980. Its totient is φ = 9000775680.

The previous prime is 13505250307. The next prime is 13505250337. The reversal of 13505250321 is 12305250531.

It is a happy number.

13505250321 is a `hidden beast` number, since 135 + 0 + 5 + 2 + 503 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5938860096 + 7566390225 = 77064^2 + 86985^2 .

It is not a de Polignac number, because 13505250321 - 2¹³ = 13505242129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13505250301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195420 + ... + 255341.

It is an arithmetic number, because the mean of its divisors is an integer number (1626123915).

Almost surely, 2^13505250321 is an apocalyptic number.

It is an amenable number.

13505250321 is a deficient number, since it is larger than the sum of its proper divisors (6008236659).

13505250321 is a wasteful number, since it uses less digits than its factorization.

13505250321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454096 (or 454093 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The spelling of 13505250321 in words is "thirteen billion, five hundred five million, two hundred fifty thousand, three hundred twenty-one".