13821073844 has 24 divisors (see below), whose sum is σ = 24535879368. Its totient is φ = 6811499520.

The previous prime is 13821073829. The next prime is 13821073853. The reversal of 13821073844 is 44837012831.

It can be written as a sum of positive squares in 4 ways, for example, as 164814244 + 13656259600 = 12838^2 + 116860^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2657 + ... + 166280.

It is an arithmetic number, because the mean of its divisors is an integer number (1022328307).

Almost surely, 2^13821073844 is an apocalyptic number.

It is an amenable number.

13821073844 is a deficient number, since it is larger than the sum of its proper divisors (10714805524).

13821073844 is a wasteful number, since it uses less digits than its factorization.

13821073844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169235 (or 169233 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 13821073844 in words is "thirteen billion, eight hundred twenty-one million, seventy-three thousand, eight hundred forty-four".