20110101217 has 2 divisors, whose sum is σ = 20110101218. Its totient is φ = 20110101216.

The previous prime is 20110101199. The next prime is 20110101241. The reversal of 20110101217 is 71210101102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20066422336 + 43678881 = 141656^2 + 6609^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110101217 - 2¹¹ = 20110099169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20110101217.

It is not a weakly prime, because it can be changed into another prime (20110101257) 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, 10055050608 + 10055050609.

It is an arithmetic number, because the mean of its divisors is an integer number (10055050609).

Almost surely, 2^20110101217 is an apocalyptic number.

It is an amenable number.

20110101217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110101217 is an equidigital number, since it uses as much as digits as its factorization.

20110101217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 16.

Adding to 20110101217 its reverse (71210101102), we get a palindrome (91320202319).

The spelling of 20110101217 in words is "twenty billion, one hundred ten million, one hundred one thousand, two hundred seventeen".