13121321305 has 8 divisors (see below), whose sum is σ = 15858864000. Its totient is φ = 10421538096.

The previous prime is 13121321287. The next prime is 13121321329. The reversal of 13121321305 is 50312312131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13121321305 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9439105 + ... + 9440494.

It is an arithmetic number, because the mean of its divisors is an integer number (1982358000).

Almost surely, 2^13121321305 is an apocalyptic number.

It is an amenable number.

13121321305 is a deficient number, since it is larger than the sum of its proper divisors (2737542695).

13121321305 is a wasteful number, since it uses less digits than its factorization.

13121321305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18879743.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 13121321305 its reverse (50312312131), we get a palindrome (63433633436).

The spelling of 13121321305 in words is "thirteen billion, one hundred twenty-one million, three hundred twenty-one thousand, three hundred five".