13453721273 has 4 divisors (see below), whose sum is σ = 14245116660. Its totient is φ = 12662325888.

The previous prime is 13453721249. The next prime is 13453721297. The reversal of 13453721273 is 37212735431.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (13453721249) and next prime (13453721297).

It can be written as a sum of positive squares in 2 ways, for example, as 12469518889 + 984202384 = 111667^2 + 31372^2 .

It is a cyclic number.

It is not a de Polignac number, because 13453721273 - 2²⁰ = 13452672697 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 (13453721213) 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, 395697668 + ... + 395697701.

It is an arithmetic number, because the mean of its divisors is an integer number (3561279165).

Almost surely, 2^13453721273 is an apocalyptic number.

It is an amenable number.

13453721273 is a deficient number, since it is larger than the sum of its proper divisors (791395387).

13453721273 is an equidigital number, since it uses as much as digits as its factorization.

13453721273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791395386.

The product of its digits is 105840, while the sum is 38.

The spelling of 13453721273 in words is "thirteen billion, four hundred fifty-three million, seven hundred twenty-one thousand, two hundred seventy-three".