13581617421 has 16 divisors (see below), whose sum is σ = 18704060928. Its totient is φ = 8757139200.

The previous prime is 13581617383. The next prime is 13581617431. The reversal of 13581617421 is 12471618531.

It is not a de Polignac number, because 13581617421 - 2¹⁹ = 13581093133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13581617421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13581617431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117625 + ... + 202481.

It is an arithmetic number, because the mean of its divisors is an integer number (1169003808).

Almost surely, 2^13581617421 is an apocalyptic number.

It is an amenable number.

13581617421 is a deficient number, since it is larger than the sum of its proper divisors (5122443507).

13581617421 is a wasteful number, since it uses less digits than its factorization.

13581617421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86612.

The product of its digits is 40320, while the sum is 39.

The spelling of 13581617421 in words is "thirteen billion, five hundred eighty-one million, six hundred seventeen thousand, four hundred twenty-one".