21424800664177 has 2 divisors, whose sum is σ = 21424800664178. Its totient is φ = 21424800664176.

The previous prime is 21424800664129. The next prime is 21424800664181. The reversal of 21424800664177 is 77146600842412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20939052998241 + 485747665936 = 4575921^2 + 696956^2 .

It is a cyclic number.

It is not a de Polignac number, because 21424800664177 - 2²³ = 21424792275569 is a prime.

It is not a weakly prime, because it can be changed into another prime (21424800664777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712400332088 + 10712400332089.

It is an arithmetic number, because the mean of its divisors is an integer number (10712400332089).

Almost surely, 2^{21424800664177} is an apocalyptic number.

It is an amenable number.

21424800664177 is a deficient number, since it is larger than the sum of its proper divisors (1).

21424800664177 is an equidigital number, since it uses as much as digits as its factorization.

21424800664177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3612672, while the sum is 52.

The spelling of 21424800664177 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred million, six hundred sixty-four thousand, one hundred seventy-seven".