13456252721 has 4 divisors (see below), whose sum is σ = 13470169152. Its totient is φ = 13442336292.

The previous prime is 13456252681. The next prime is 13456252753. The reversal of 13456252721 is 12725265431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12725265431 = 151 ⋅84273281.

It is a cyclic number.

It is not a de Polignac number, because 13456252721 - 2⁶ = 13456252657 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 (13456255721) 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, 6956765 + ... + 6958698.

It is an arithmetic number, because the mean of its divisors is an integer number (3367542288).

Almost surely, 2^13456252721 is an apocalyptic number.

It is an amenable number.

13456252721 is a deficient number, since it is larger than the sum of its proper divisors (13916431).

13456252721 is an equidigital number, since it uses as much as digits as its factorization.

13456252721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13916430.

The product of its digits is 100800, while the sum is 38.

The spelling of 13456252721 in words is "thirteen billion, four hundred fifty-six million, two hundred fifty-two thousand, seven hundred twenty-one".