21052675834081 has 4 divisors (see below), whose sum is σ = 21052687330564. Its totient is φ = 21052664337600.

The previous prime is 21052675834067. The next prime is 21052675834093. The reversal of 21052675834081 is 18043857625012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11839902919056 + 9212772915025 = 3440916^2 + 3035255^2 .

It is a cyclic number.

It is not a de Polignac number, because 21052675834081 - 2⁹ = 21052675833569 is a prime.

It is a super-2 number, since 2×21052675834081² (a number of 27 digits) contains 22 as substring.

It is the 4588320-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21052675834051) by changing a digit.

It is a nontrivial repunit in base 4588319.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2319780 + ... + 6891061.

It is an arithmetic number, because the mean of its divisors is an integer number (5263171832641).

Almost surely, 2^{21052675834081} is an apocalyptic number.

It is an amenable number.

21052675834081 is a deficient number, since it is larger than the sum of its proper divisors (11496483).

21052675834081 is an equidigital number, since it uses as much as digits as its factorization.

21052675834081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11496482.

The product of its (nonzero) digits is 3225600, while the sum is 52.

The spelling of 21052675834081 in words is "twenty-one trillion, fifty-two billion, six hundred seventy-five million, eight hundred thirty-four thousand, eighty-one".