13158387541721 has 8 divisors (see below), whose sum is σ = 13182559050600. Its totient is φ = 13134219704320.

The previous prime is 13158387541693. The next prime is 13158387541729. The reversal of 13158387541721 is 12714578385131.

It can be written as a sum of positive squares in 4 ways, for example, as 1099853490121 + 12058534051600 = 1048739^2 + 3472540^2 .

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-13158387541721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13158387541729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6308801 + ... + 8131281.

It is an arithmetic number, because the mean of its divisors is an integer number (1647819881325).

Almost surely, 2^{13158387541721} is an apocalyptic number.

It is an amenable number.

13158387541721 is a deficient number, since it is larger than the sum of its proper divisors (24171508879).

13158387541721 is a wasteful number, since it uses less digits than its factorization.

13158387541721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835739.

The product of its digits is 5644800, while the sum is 56.

The spelling of 13158387541721 in words is "thirteen trillion, one hundred fifty-eight billion, three hundred eighty-seven million, five hundred forty-one thousand, seven hundred twenty-one".