21000323177 has 2 divisors, whose sum is σ = 21000323178. Its totient is φ = 21000323176.

The previous prime is 21000323171. The next prime is 21000323231. The reversal of 21000323177 is 77132300012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17581699216 + 3418623961 = 132596^2 + 58469^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000323177 - 2²² = 20996128873 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000323171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500161588 + 10500161589.

It is an arithmetic number, because the mean of its divisors is an integer number (10500161589).

Almost surely, 2^21000323177 is an apocalyptic number.

It is an amenable number.

21000323177 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000323177 is an equidigital number, since it uses as much as digits as its factorization.

21000323177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 26.

Adding to 21000323177 its reverse (77132300012), we get a palindrome (98132623189).

The spelling of 21000323177 in words is "twenty-one billion, three hundred twenty-three thousand, one hundred seventy-seven".