15421440223439 has 2 divisors, whose sum is σ = 15421440223440. Its totient is φ = 15421440223438.

The previous prime is 15421440223417. The next prime is 15421440223499. The reversal of 15421440223439 is 93432204412451.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15421440223439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15421440223439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15421440223499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7710720111719 + 7710720111720.

It is an arithmetic number, because the mean of its divisors is an integer number (7710720111720).

Almost surely, 2^{15421440223439} is an apocalyptic number.

15421440223439 is a deficient number, since it is larger than the sum of its proper divisors (1).

15421440223439 is an equidigital number, since it uses as much as digits as its factorization.

15421440223439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 44.

The spelling of 15421440223439 in words is "fifteen trillion, four hundred twenty-one billion, four hundred forty million, two hundred twenty-three thousand, four hundred thirty-nine".