11021220217121 has 2 divisors, whose sum is σ = 11021220217122. Its totient is φ = 11021220217120.

The previous prime is 11021220217061. The next prime is 11021220217129. The reversal of 11021220217121 is 12171202212011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10851331986496 + 169888230625 = 3294136^2 + 412175^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021220217121 - 2¹⁴ = 11021220200737 is a prime.

It is not a weakly prime, because it can be changed into another prime (11021220217129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510610108560 + 5510610108561.

It is an arithmetic number, because the mean of its divisors is an integer number (5510610108561).

Almost surely, 2^{11021220217121} is an apocalyptic number.

It is an amenable number.

11021220217121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021220217121 is an equidigital number, since it uses as much as digits as its factorization.

11021220217121 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 23.

Adding to 11021220217121 its reverse (12171202212011), we get a palindrome (23192422429132).

The spelling of 11021220217121 in words is "eleven trillion, twenty-one billion, two hundred twenty million, two hundred seventeen thousand, one hundred twenty-one".