11222211110021 has 2 divisors, whose sum is σ = 11222211110022. Its totient is φ = 11222211110020.

The previous prime is 11222211109999. The next prime is 11222211110023. The reversal of 11222211110021 is 12001111222211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8684278548100 + 2537932561921 = 2946910^2 + 1593089^2 .

It is an emirp because it is prime and its reverse (12001111222211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11222211110021 - 2³⁰ = 11221137368197 is a prime.

Together with 11222211110023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11222211110023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5611105555010 + 5611105555011.

It is an arithmetic number, because the mean of its divisors is an integer number (5611105555011).

Almost surely, 2^{11222211110021} is an apocalyptic number.

It is an amenable number.

11222211110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11222211110021 is an equidigital number, since it uses as much as digits as its factorization.

11222211110021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11222211110021 its reverse (12001111222211), we get a palindrome (23223322332232).

The spelling of 11222211110021 in words is "eleven trillion, two hundred twenty-two billion, two hundred eleven million, one hundred ten thousand, twenty-one".