21146554164341 has 2 divisors, whose sum is σ = 21146554164342. Its totient is φ = 21146554164340.

The previous prime is 21146554164313. The next prime is 21146554164391. The reversal of 21146554164341 is 14346145564112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20339649002500 + 806905161841 = 4509950^2 + 898279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21146554164341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21146554164391) 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, 10573277082170 + 10573277082171.

It is an arithmetic number, because the mean of its divisors is an integer number (10573277082171).

Almost surely, 2^{21146554164341} is an apocalyptic number.

It is an amenable number.

21146554164341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21146554164341 is an equidigital number, since it uses as much as digits as its factorization.

21146554164341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1382400, while the sum is 47.

The spelling of 21146554164341 in words is "twenty-one trillion, one hundred forty-six billion, five hundred fifty-four million, one hundred sixty-four thousand, three hundred forty-one".