221111116022021 has 2 divisors, whose sum is σ = 221111116022022. Its totient is φ = 221111116022020.

The previous prime is 221111116022003. The next prime is 221111116022039. The reversal of 221111116022021 is 120220611111122.

It is a balanced prime because it is at equal distance from previous prime (221111116022003) and next prime (221111116022039).

It can be written as a sum of positive squares in only one way, i.e., 213871174192225 + 7239941829796 = 14624335^2 + 2690714^2 .

It is a cyclic number.

It is not a de Polignac number, because 221111116022021 - 2²² = 221111111827717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221111116025021) 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, 110555558011010 + 110555558011011.

It is an arithmetic number, because the mean of its divisors is an integer number (110555558011011).

Almost surely, 2^{221111116022021} is an apocalyptic number.

It is an amenable number.

221111116022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111116022021 is an equidigital number, since it uses as much as digits as its factorization.

221111116022021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 23.

Adding to 221111116022021 its reverse (120220611111122), we get a palindrome (341331727133143).

The spelling of 221111116022021 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred sixteen million, twenty-two thousand, twenty-one".