11020121221 has 2 divisors, whose sum is σ = 11020121222. Its totient is φ = 11020121220.

The previous prime is 11020121213. The next prime is 11020121237. The reversal of 11020121221 is 12212102011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6411204900 + 4608916321 = 80070^2 + 67889^2 .

It is a cyclic number.

It is not a de Polignac number, because 11020121221 - 2³ = 11020121213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11020121251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510060610 + 5510060611.

It is an arithmetic number, because the mean of its divisors is an integer number (5510060611).

Almost surely, 2^11020121221 is an apocalyptic number.

It is an amenable number.

11020121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11020121221 is an equidigital number, since it uses as much as digits as its factorization.

11020121221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11020121221 its reverse (12212102011), we get a palindrome (23232223232).

The spelling of 11020121221 in words is "eleven billion, twenty million, one hundred twenty-one thousand, two hundred twenty-one".