13261021465 has 8 divisors (see below), whose sum is σ = 15915109320. Its totient is φ = 10607561472.

The previous prime is 13261021463. The next prime is 13261021483. The reversal of 13261021465 is 56412016231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4661612176 + 8599409289 = 68276^2 + 92733^2 .

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 13261021465 - 2¹ = 13261021463 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13261021463) 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, 109174 + ... + 196063.

It is an arithmetic number, because the mean of its divisors is an integer number (1989388665).

Almost surely, 2^13261021465 is an apocalyptic number.

It is an amenable number.

13261021465 is a deficient number, since it is larger than the sum of its proper divisors (2654087855).

13261021465 is an equidigital number, since it uses as much as digits as its factorization.

13261021465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313931.

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

Adding to 13261021465 its reverse (56412016231), we get a palindrome (69673037696).

The spelling of 13261021465 in words is "thirteen billion, two hundred sixty-one million, twenty-one thousand, four hundred sixty-five".