13263994621 has 4 divisors (see below), whose sum is σ = 13264271644. Its totient is φ = 13263717600.

The previous prime is 13263994619. The next prime is 13263994651. The reversal of 13263994621 is 12649936231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12649936231 = 6361 ⋅1988671.

It can be written as a sum of positive squares in 2 ways, for example, as 7910145721 + 5353848900 = 88939^2 + 73170^2 .

It is a cyclic number.

It is not a de Polignac number, because 13263994621 - 2¹ = 13263994619 is a prime.

It is a deceptive number, since it divides R_13263994620.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13263994651) 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, 46170 + ... + 169291.

It is an arithmetic number, because the mean of its divisors is an integer number (3316067911).

It is a Poulet number, since it divides 2^13263994620-1.

Almost surely, 2^13263994621 is an apocalyptic number.

13263994621 is the 61561-st nonagonal number.

It is an amenable number.

13263994621 is a deficient number, since it is larger than the sum of its proper divisors (277023).

13263994621 is an equidigital number, since it uses as much as digits as its factorization.

13263994621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277022.

The product of its digits is 419904, while the sum is 46.

The spelling of 13263994621 in words is "thirteen billion, two hundred sixty-three million, nine hundred ninety-four thousand, six hundred twenty-one".