844424930131921 has 2 divisors, whose sum is σ = 844424930131922. Its totient is φ = 844424930131920.

The previous prime is 844424930131907. The next prime is 844424930131961. The reversal of 844424930131921 is 129131039424448.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504104158725696 + 340320771406225 = 22452264^2 + 18447785^2 .

It is a cyclic number.

It is not a de Polignac number, because 844424930131921 - 2¹⁷ = 844424930000849 is a prime.

It is not a weakly prime, because it can be changed into another prime (844424930131961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422212465065960 + 422212465065961.

It is an arithmetic number, because the mean of its divisors is an integer number (422212465065961).

Almost surely, 2^{844424930131921} is an apocalyptic number.

It is an amenable number.

844424930131921 is a deficient number, since it is larger than the sum of its proper divisors (1).

844424930131921 is an equidigital number, since it uses as much as digits as its factorization.

844424930131921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5971968, while the sum is 55.

The spelling of 844424930131921 in words is "eight hundred forty-four trillion, four hundred twenty-four billion, nine hundred thirty million, one hundred thirty-one thousand, nine hundred twenty-one".