22221020111021 has 2 divisors, whose sum is σ = 22221020111022. Its totient is φ = 22221020111020.

The previous prime is 22221020111011. The next prime is 22221020111023. The reversal of 22221020111021 is 12011102012222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15875084766025 + 6345935344996 = 3984355^2 + 2519114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22221020111021 is a prime.

It is a Sophie Germain prime.

Together with 22221020111023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22221020111023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110510055510 + 11110510055511.

It is an arithmetic number, because the mean of its divisors is an integer number (11110510055511).

Almost surely, 2^{22221020111021} is an apocalyptic number.

It is an amenable number.

22221020111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221020111021 is an equidigital number, since it uses as much as digits as its factorization.

22221020111021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 22221020111021 its reverse (12011102012222), we get a palindrome (34232122123243).

The spelling of 22221020111021 in words is "twenty-two trillion, two hundred twenty-one billion, twenty million, one hundred eleven thousand, twenty-one".