15421440223573 has 2 divisors, whose sum is σ = 15421440223574. Its totient is φ = 15421440223572.

The previous prime is 15421440223549. The next prime is 15421440223583. The reversal of 15421440223573 is 37532204412451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14438958818769 + 982481404804 = 3799863^2 + 991202^2 .

It is a cyclic number.

It is not a de Polignac number, because 15421440223573 - 2²¹ = 15421438126421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15421440223583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7710720111786 + 7710720111787.

It is an arithmetic number, because the mean of its divisors is an integer number (7710720111787).

Almost surely, 2^{15421440223573} is an apocalyptic number.

It is an amenable number.

15421440223573 is a deficient number, since it is larger than the sum of its proper divisors (1).

15421440223573 is an equidigital number, since it uses as much as digits as its factorization.

15421440223573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 43.

The spelling of 15421440223573 in words is "fifteen trillion, four hundred twenty-one billion, four hundred forty million, two hundred twenty-three thousand, five hundred seventy-three".