13354344721 has 3 divisors (see below), whose sum is σ = 13354460283. Its totient is φ = 13354229160.

The previous prime is 13354344673. The next prime is 13354344727. The reversal of 13354344721 is 12744345331.

The square root of 13354344721 is 115561.

It is a perfect power (a square), and thus also a powerful number.

13354344721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 385690321 + 12968654400 = 19639^2 + 113880^2 .

It is not a de Polignac number, because 13354344721 - 2³³ = 4764410129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13354344727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 57781 + ... + 173341.

It is an arithmetic number, because the mean of its divisors is an integer number (4451486761).

Almost surely, 2^13354344721 is an apocalyptic number.

13354344721 is the 115561-st square number.

13354344721 is the 57781-st centered octagonal number.

It is an amenable number.

13354344721 is a deficient number, since it is larger than the sum of its proper divisors (115562).

13354344721 is an frugal number, since it uses more digits than its factorization.

13354344721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231122 (or 115561 counting only the distinct ones).

The product of its digits is 120960, while the sum is 37.

The spelling of 13354344721 in words is "thirteen billion, three hundred fifty-four million, three hundred forty-four thousand, seven hundred twenty-one".