20985660271733 has 2 divisors, whose sum is σ = 20985660271734. Its totient is φ = 20985660271732.

The previous prime is 20985660271703. The next prime is 20985660271759. The reversal of 20985660271733 is 33717206658902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19384137118564 + 1601523153169 = 4402742^2 + 1265513^2 .

It is a cyclic number.

It is not a de Polignac number, because 20985660271733 - 2¹⁰ = 20985660270709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20985660271703) 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, 10492830135866 + 10492830135867.

It is an arithmetic number, because the mean of its divisors is an integer number (10492830135867).

Almost surely, 2^{20985660271733} is an apocalyptic number.

It is an amenable number.

20985660271733 is a deficient number, since it is larger than the sum of its proper divisors (1).

20985660271733 is an equidigital number, since it uses as much as digits as its factorization.

20985660271733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22861440, while the sum is 59.

The spelling of 20985660271733 in words is "twenty trillion, nine hundred eighty-five billion, six hundred sixty million, two hundred seventy-one thousand, seven hundred thirty-three".