13189270721 has 4 divisors (see below), whose sum is σ = 14388295344. Its totient is φ = 11990246100.

The previous prime is 13189270681. The next prime is 13189270741. The reversal of 13189270721 is 12707298131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13189270721 - 2¹⁰ = 13189269697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13189270741) 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, 599512295 + ... + 599512316.

It is an arithmetic number, because the mean of its divisors is an integer number (3597073836).

Almost surely, 2^13189270721 is an apocalyptic number.

13189270721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13189270721 is a deficient number, since it is larger than the sum of its proper divisors (1199024623).

13189270721 is a wasteful number, since it uses less digits than its factorization.

13189270721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199024622.

The product of its (nonzero) digits is 42336, while the sum is 41.

The spelling of 13189270721 in words is "thirteen billion, one hundred eighty-nine million, two hundred seventy thousand, seven hundred twenty-one".