7384543249921 has 2 divisors, whose sum is σ = 7384543249922. Its totient is φ = 7384543249920.

The previous prime is 7384543249879. The next prime is 7384543249933. The reversal of 7384543249921 is 1299423454837.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7066744972225 + 317798277696 = 2658335^2 + 563736^2 .

It is an emirp because it is prime and its reverse (1299423454837) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7384543249921 - 2⁷ = 7384543249793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7384543249921.

It is not a weakly prime, because it can be changed into another prime (7384543249961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3692271624960 + 3692271624961.

It is an arithmetic number, because the mean of its divisors is an integer number (3692271624961).

Almost surely, 2^{7384543249921} is an apocalyptic number.

It is an amenable number.

7384543249921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7384543249921 is an equidigital number, since it uses as much as digits as its factorization.

7384543249921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52254720, while the sum is 61.

The spelling of 7384543249921 in words is "seven trillion, three hundred eighty-four billion, five hundred forty-three million, two hundred forty-nine thousand, nine hundred twenty-one".