21423765708589 has 2 divisors, whose sum is σ = 21423765708590. Its totient is φ = 21423765708588.

The previous prime is 21423765708557. The next prime is 21423765708671. The reversal of 21423765708589 is 98580756732412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17656509861225 + 3767255847364 = 4201965^2 + 1940942^2 .

It is a cyclic number.

It is not a de Polignac number, because 21423765708589 - 2⁵ = 21423765708557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21423765708529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711882854294 + 10711882854295.

It is an arithmetic number, because the mean of its divisors is an integer number (10711882854295).

It is a 1-persistent number, because it is pandigital, but 2⋅21423765708589 = 42847531417178 is not.

Almost surely, 2^{21423765708589} is an apocalyptic number.

It is an amenable number.

21423765708589 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423765708589 is an equidigital number, since it uses as much as digits as its factorization.

21423765708589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 203212800, while the sum is 67.

The spelling of 21423765708589 in words is "twenty-one trillion, four hundred twenty-three billion, seven hundred sixty-five million, seven hundred eight thousand, five hundred eighty-nine".