20110221001217 has 2 divisors, whose sum is σ = 20110221001218. Its totient is φ = 20110221001216.

The previous prime is 20110221001069. The next prime is 20110221001271. The reversal of 20110221001217 is 71210012201102.

It is a happy number.

Together with next prime (20110221001271) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19069431324736 + 1040789676481 = 4366856^2 + 1020191^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110221001217 - 2¹⁸ = 20110220739073 is a prime.

It is not a weakly prime, because it can be changed into another prime (20110221001517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055110500608 + 10055110500609.

It is an arithmetic number, because the mean of its divisors is an integer number (10055110500609).

Almost surely, 2^{20110221001217} is an apocalyptic number.

It is an amenable number.

20110221001217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110221001217 is an equidigital number, since it uses as much as digits as its factorization.

20110221001217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 20110221001217 its reverse (71210012201102), we get a palindrome (91320233202319).

The spelling of 20110221001217 in words is "twenty trillion, one hundred ten billion, two hundred twenty-one million, one thousand, two hundred seventeen".