7138844244521 has 4 divisors (see below), whose sum is σ = 7787830084944. Its totient is φ = 6489858404100.

The previous prime is 7138844244481. The next prime is 7138844244527. The reversal of 7138844244521 is 1254424488317.

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.

It is a cyclic number.

It is not a de Polignac number, because 7138844244521 - 2²² = 7138840050217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7138844244527) 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, 324492920195 + ... + 324492920216.

It is an arithmetic number, because the mean of its divisors is an integer number (1946957521236).

Almost surely, 2^{7138844244521} is an apocalyptic number.

It is an amenable number.

7138844244521 is a deficient number, since it is larger than the sum of its proper divisors (648985840423).

7138844244521 is a wasteful number, since it uses less digits than its factorization.

7138844244521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648985840422.

The product of its digits is 6881280, while the sum is 53.

The spelling of 7138844244521 in words is "seven trillion, one hundred thirty-eight billion, eight hundred forty-four million, two hundred forty-four thousand, five hundred twenty-one".