21835035200681 has 2 divisors, whose sum is σ = 21835035200682. Its totient is φ = 21835035200680.

The previous prime is 21835035200651. The next prime is 21835035200689. The reversal of 21835035200681 is 18600253053812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20404418265625 + 1430616935056 = 4517125^2 + 1196084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21835035200681 is a prime.

It is a super-2 number, since 2×21835035200681² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21835035200689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10917517600340 + 10917517600341.

It is an arithmetic number, because the mean of its divisors is an integer number (10917517600341).

Almost surely, 2^{21835035200681} is an apocalyptic number.

It is an amenable number.

21835035200681 is a deficient number, since it is larger than the sum of its proper divisors (1).

21835035200681 is an equidigital number, since it uses as much as digits as its factorization.

21835035200681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 21835035200681 in words is "twenty-one trillion, eight hundred thirty-five billion, thirty-five million, two hundred thousand, six hundred eighty-one".