13361085821 has 4 divisors (see below), whose sum is σ = 13483664700. Its totient is φ = 13238506944.

The previous prime is 13361085743. The next prime is 13361085869. The reversal of 13361085821 is 12858016331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8792812900 + 4568272921 = 93770^2 + 67589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13361085821 is a prime.

It is a super-2 number, since 2×13361085821² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13361082821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61289276 + ... + 61289493.

It is an arithmetic number, because the mean of its divisors is an integer number (3370916175).

Almost surely, 2^13361085821 is an apocalyptic number.

It is an amenable number.

13361085821 is a deficient number, since it is larger than the sum of its proper divisors (122578879).

13361085821 is a wasteful number, since it uses less digits than its factorization.

13361085821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122578878.

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 13361085821 in words is "thirteen billion, three hundred sixty-one million, eighty-five thousand, eight hundred twenty-one".