21393882589 has 2 divisors, whose sum is σ = 21393882590. Its totient is φ = 21393882588.

The previous prime is 21393882583. The next prime is 21393882593. The reversal of 21393882589 is 98528839312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21317460025 + 76422564 = 146005^2 + 8742^2 .

It is a cyclic number.

It is not a de Polignac number, because 21393882589 - 2⁵ = 21393882557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21393882583) 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, 10696941294 + 10696941295.

It is an arithmetic number, because the mean of its divisors is an integer number (10696941295).

Almost surely, 2^21393882589 is an apocalyptic number.

It is an amenable number.

21393882589 is a deficient number, since it is larger than the sum of its proper divisors (1).

21393882589 is an equidigital number, since it uses as much as digits as its factorization.

21393882589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7464960, while the sum is 58.

The spelling of 21393882589 in words is "twenty-one billion, three hundred ninety-three million, eight hundred eighty-two thousand, five hundred eighty-nine".