13221641065 has 4 divisors (see below), whose sum is σ = 15865969284. Its totient is φ = 10577312848.

The previous prime is 13221641051. The next prime is 13221641119. The reversal of 13221641065 is 56014612231.

It is a happy number.

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 7201898496 + 6019742569 = 84864^2 + 77587^2 .

It is a cyclic number.

It is not a de Polignac number, because 13221641065 - 2³¹ = 11074157417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1322164102 + ... + 1322164111.

It is an arithmetic number, because the mean of its divisors is an integer number (3966492321).

Almost surely, 2^13221641065 is an apocalyptic number.

It is an amenable number.

13221641065 is a deficient number, since it is larger than the sum of its proper divisors (2644328219).

13221641065 is an equidigital number, since it uses as much as digits as its factorization.

13221641065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644328218.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 13221641065 in words is "thirteen billion, two hundred twenty-one million, six hundred forty-one thousand, sixty-five".