221002202111021 has 2 divisors, whose sum is σ = 221002202111022. Its totient is φ = 221002202111020.

The previous prime is 221002202110999. The next prime is 221002202111023. The reversal of 221002202111021 is 120111202200122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139792456504996 + 81209745606025 = 11823386^2 + 9011645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221002202111021 is a prime.

Together with 221002202111023, 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 (221002202111023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110501101055510 + 110501101055511.

It is an arithmetic number, because the mean of its divisors is an integer number (110501101055511).

Almost surely, 2^{221002202111021} is an apocalyptic number.

It is an amenable number.

221002202111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

221002202111021 is an equidigital number, since it uses as much as digits as its factorization.

221002202111021 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 221002202111021 its reverse (120111202200122), we get a palindrome (341113404311143).

The spelling of 221002202111021 in words is "two hundred twenty-one trillion, two billion, two hundred two million, one hundred eleven thousand, twenty-one".