21010220101177 has 2 divisors, whose sum is σ = 21010220101178. Its totient is φ = 21010220101176.

The previous prime is 21010220101163. The next prime is 21010220101219. The reversal of 21010220101177 is 77110102201012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19177488982521 + 1832731118656 = 4379211^2 + 1353784^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010220101177 - 2⁷ = 21010220101049 is a prime.

It is not a weakly prime, because it can be changed into another prime (21010220101147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505110050588 + 10505110050589.

It is an arithmetic number, because the mean of its divisors is an integer number (10505110050589).

Almost surely, 2^{21010220101177} is an apocalyptic number.

It is an amenable number.

21010220101177 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010220101177 is an equidigital number, since it uses as much as digits as its factorization.

21010220101177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 25.

Adding to 21010220101177 its reverse (77110102201012), we get a palindrome (98120322302189).

The spelling of 21010220101177 in words is "twenty-one trillion, ten billion, two hundred twenty million, one hundred one thousand, one hundred seventy-seven".