21053821184177 has 2 divisors, whose sum is σ = 21053821184178. Its totient is φ = 21053821184176.

The previous prime is 21053821184161. The next prime is 21053821184239. The reversal of 21053821184177 is 77148112835012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13764166780081 + 7289654404096 = 3710009^2 + 2699936^2 .

It is a cyclic number.

It is not a de Polignac number, because 21053821184177 - 2⁴ = 21053821184161 is a prime.

It is not a weakly prime, because it can be changed into another prime (21053821184107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10526910592088 + 10526910592089.

It is an arithmetic number, because the mean of its divisors is an integer number (10526910592089).

Almost surely, 2^{21053821184177} is an apocalyptic number.

It is an amenable number.

21053821184177 is a deficient number, since it is larger than the sum of its proper divisors (1).

21053821184177 is an equidigital number, since it uses as much as digits as its factorization.

21053821184177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 752640, while the sum is 50.

The spelling of 21053821184177 in words is "twenty-one trillion, fifty-three billion, eight hundred twenty-one million, one hundred eighty-four thousand, one hundred seventy-seven".