21613321371589 has 2 divisors, whose sum is σ = 21613321371590. Its totient is φ = 21613321371588.

The previous prime is 21613321371583. The next prime is 21613321371673. The reversal of 21613321371589 is 98517312331612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15934131930564 + 5679189441025 = 3991758^2 + 2383105^2 .

It is a cyclic number.

It is not a de Polignac number, because 21613321371589 - 2⁹ = 21613321371077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21613321371583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806660685794 + 10806660685795.

It is an arithmetic number, because the mean of its divisors is an integer number (10806660685795).

Almost surely, 2^{21613321371589} is an apocalyptic number.

It is an amenable number.

21613321371589 is a deficient number, since it is larger than the sum of its proper divisors (1).

21613321371589 is an equidigital number, since it uses as much as digits as its factorization.

21613321371589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 52.

The spelling of 21613321371589 in words is "twenty-one trillion, six hundred thirteen billion, three hundred twenty-one million, three hundred seventy-one thousand, five hundred eighty-nine".