21046369177 has 2 divisors, whose sum is σ = 21046369178. Its totient is φ = 21046369176.

The previous prime is 21046369147. The next prime is 21046369187. The reversal of 21046369177 is 77196364012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18929357056 + 2117012121 = 137584^2 + 46011^2 .

It is a cyclic number.

It is not a de Polignac number, because 21046369177 - 2²³ = 21037980569 is a prime.

It is not a weakly prime, because it can be changed into another prime (21046369147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10523184588 + 10523184589.

It is an arithmetic number, because the mean of its divisors is an integer number (10523184589).

Almost surely, 2^21046369177 is an apocalyptic number.

It is an amenable number.

21046369177 is a deficient number, since it is larger than the sum of its proper divisors (1).

21046369177 is an equidigital number, since it uses as much as digits as its factorization.

21046369177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 21046369177 in words is "twenty-one billion, forty-six million, three hundred sixty-nine thousand, one hundred seventy-seven".