11011020011221 has 2 divisors, whose sum is σ = 11011020011222. Its totient is φ = 11011020011220.

The previous prime is 11011020011207. The next prime is 11011020011237. The reversal of 11011020011221 is 12211002011011.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8690762960100 + 2320257051121 = 2948010^2 + 1523239^2 .

It is a cyclic number.

It is not a de Polignac number, because 11011020011221 - 2⁹ = 11011020010709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11011020011291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505510005610 + 5505510005611.

It is an arithmetic number, because the mean of its divisors is an integer number (5505510005611).

Almost surely, 2^{11011020011221} is an apocalyptic number.

It is an amenable number.

11011020011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011020011221 is an equidigital number, since it uses as much as digits as its factorization.

11011020011221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11011020011221 its reverse (12211002011011), we get a palindrome (23222022022232).

The spelling of 11011020011221 in words is "eleven trillion, eleven billion, twenty million, eleven thousand, two hundred twenty-one".