13205421315 has 12 divisors (see below), whose sum is σ = 22889397024. Its totient is φ = 7042891344.

The previous prime is 13205421283. The next prime is 13205421367. The reversal of 13205421315 is 51312450231.

13205421315 is a `hidden beast` number, since 1 + 3 + 205 + 421 + 31 + 5 = 666.

It is not a de Polignac number, because 13205421315 - 2⁵ = 13205421283 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146726859 + ... + 146726948.

It is an arithmetic number, because the mean of its divisors is an integer number (1907449752).

Almost surely, 2^13205421315 is an apocalyptic number.

13205421315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13205421315 is a deficient number, since it is larger than the sum of its proper divisors (9683975709).

13205421315 is a wasteful number, since it uses less digits than its factorization.

13205421315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293453818 (or 293453815 counting only the distinct ones).

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

Adding to 13205421315 its reverse (51312450231), we get a palindrome (64517871546).

The spelling of 13205421315 in words is "thirteen billion, two hundred five million, four hundred twenty-one thousand, three hundred fifteen".