21425355171593 has 2 divisors, whose sum is σ = 21425355171594. Its totient is φ = 21425355171592.

The previous prime is 21425355171589. The next prime is 21425355171607. The reversal of 21425355171593 is 39517155352412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20746959143689 + 678396027904 = 4554883^2 + 823648^2 .

It is a cyclic number.

It is not a de Polignac number, because 21425355171593 - 2² = 21425355171589 is a prime.

It is not a weakly prime, because it can be changed into another prime (21425355171193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712677585796 + 10712677585797.

It is an arithmetic number, because the mean of its divisors is an integer number (10712677585797).

Almost surely, 2^{21425355171593} is an apocalyptic number.

It is an amenable number.

21425355171593 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425355171593 is an equidigital number, since it uses as much as digits as its factorization.

21425355171593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670000, while the sum is 53.

The spelling of 21425355171593 in words is "twenty-one trillion, four hundred twenty-five billion, three hundred fifty-five million, one hundred seventy-one thousand, five hundred ninety-three".