13844225721 has 16 divisors (see below), whose sum is σ = 19438126400. Its totient is φ = 8740286208.

The previous prime is 13844225719. The next prime is 13844225749. The reversal of 13844225721 is 12752244831.

It is a happy number.

It is not a de Polignac number, because 13844225721 - 2¹ = 13844225719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13844225721.

It is not an unprimeable number, because it can be changed into a prime (13844225701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102765 + ... + 195573.

It is an arithmetic number, because the mean of its divisors is an integer number (1214882900).

Almost surely, 2^13844225721 is an apocalyptic number.

It is an amenable number.

13844225721 is a deficient number, since it is larger than the sum of its proper divisors (5593900679).

13844225721 is a wasteful number, since it uses less digits than its factorization.

13844225721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95448.

The product of its digits is 107520, while the sum is 39.

The spelling of 13844225721 in words is "thirteen billion, eight hundred forty-four million, two hundred twenty-five thousand, seven hundred twenty-one".