13581913921 has 8 divisors (see below), whose sum is σ = 14388037344. Its totient is φ = 12776589120.

The previous prime is 13581913897. The next prime is 13581913999. The reversal of 13581913921 is 12931918531.

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

It is a cyclic number.

It is not a de Polignac number, because 13581913921 - 2¹⁷ = 13581782849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13581913021) 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, 164455 + ... + 232828.

It is an arithmetic number, because the mean of its divisors is an integer number (1798504668).

Almost surely, 2^13581913921 is an apocalyptic number.

It is an amenable number.

13581913921 is a deficient number, since it is larger than the sum of its proper divisors (806123423).

13581913921 is a wasteful number, since it uses less digits than its factorization.

13581913921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399311.

The product of its digits is 58320, while the sum is 43.

The spelling of 13581913921 in words is "thirteen billion, five hundred eighty-one million, nine hundred thirteen thousand, nine hundred twenty-one".