13021267653 has 12 divisors (see below), whose sum is σ = 18827375788. Its totient is φ = 8672132160.

The previous prime is 13021267643. The next prime is 13021267673. The reversal of 13021267653 is 35676212031.

It can be written as a sum of positive squares in 2 ways, for example, as 9117767169 + 3903500484 = 95487^2 + 62478^2 .

It is not a de Polignac number, because 13021267653 - 2¹⁸ = 13021005509 is a prime.

It is a super-2 number, since 2×13021267653² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13021267603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 716608 + ... + 734553.

Almost surely, 2^13021267653 is an apocalyptic number.

It is an amenable number.

13021267653 is a deficient number, since it is larger than the sum of its proper divisors (5806108135).

13021267653 is a wasteful number, since it uses less digits than its factorization.

13021267653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452164 (or 1452161 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

Adding to 13021267653 its reverse (35676212031), we get a palindrome (48697479684).

The spelling of 13021267653 in words is "thirteen billion, twenty-one million, two hundred sixty-seven thousand, six hundred fifty-three".