11221120111021 has 2 divisors, whose sum is σ = 11221120111022. Its totient is φ = 11221120111020.

The previous prime is 11221120110953. The next prime is 11221120111027. The reversal of 11221120111021 is 12011102112211.

11221120111021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7386377048521 + 3834743062500 = 2717789^2 + 1958250^2 .

It is a cyclic number.

It is not a de Polignac number, because 11221120111021 - 2⁹ = 11221120110509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11221120110986 and 11221120111004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11221120111027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610560055510 + 5610560055511.

It is an arithmetic number, because the mean of its divisors is an integer number (5610560055511).

Almost surely, 2^{11221120111021} is an apocalyptic number.

It is an amenable number.

11221120111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221120111021 is an equidigital number, since it uses as much as digits as its factorization.

11221120111021 is an evil number, because the sum of its binary digits is even.

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

Adding to 11221120111021 its reverse (12011102112211), we get a palindrome (23232222223232).

The spelling of 11221120111021 in words is "eleven trillion, two hundred twenty-one billion, one hundred twenty million, one hundred eleven thousand, twenty-one".