11101011220021 has 2 divisors, whose sum is σ = 11101011220022. Its totient is φ = 11101011220020.

The previous prime is 11101011220003. The next prime is 11101011220087. The reversal of 11101011220021 is 12002211010111.

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., 11032435323121 + 68575896900 = 3321511^2 + 261870^2 .

It is a cyclic number.

It is not a de Polignac number, because 11101011220021 - 2³⁵ = 11066651481653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11101011219983 and 11101011220010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11101011220421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550505610010 + 5550505610011.

It is an arithmetic number, because the mean of its divisors is an integer number (5550505610011).

Almost surely, 2^{11101011220021} is an apocalyptic number.

It is an amenable number.

11101011220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11101011220021 is an equidigital number, since it uses as much as digits as its factorization.

11101011220021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 11101011220021 its reverse (12002211010111), we get a palindrome (23103222230132).

The spelling of 11101011220021 in words is "eleven trillion, one hundred one billion, eleven million, two hundred twenty thousand, twenty-one".