2011021221217 has 2 divisors, whose sum is σ = 2011021221218. Its totient is φ = 2011021221216.

The previous prime is 2011021221161. The next prime is 2011021221241. The reversal of 2011021221217 is 7121221201102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1085761916001 + 925259305216 = 1041999^2 + 961904^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011021221217 is a prime.

It is a super-2 number, since 2×2011021221217² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2011021221277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005510610608 + 1005510610609.

It is an arithmetic number, because the mean of its divisors is an integer number (1005510610609).

Almost surely, 2^{2011021221217} is an apocalyptic number.

It is an amenable number.

2011021221217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011021221217 is an equidigital number, since it uses as much as digits as its factorization.

2011021221217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 2011021221217 its reverse (7121221201102), we get a palindrome (9132242422319).

The spelling of 2011021221217 in words is "two trillion, eleven billion, twenty-one million, two hundred twenty-one thousand, two hundred seventeen".