221021211211189 has 2 divisors, whose sum is σ = 221021211211190. Its totient is φ = 221021211211188.

The previous prime is 221021211211093. The next prime is 221021211211247. The reversal of 221021211211189 is 981112112120122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201772081622500 + 19249129588689 = 14204650^2 + 4387383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221021211211189 is a prime.

It is a super-2 number, since 2×221021211211189² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281021211211189) 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, 110510605605594 + 110510605605595.

It is an arithmetic number, because the mean of its divisors is an integer number (110510605605595).

Almost surely, 2^{221021211211189} is an apocalyptic number.

It is an amenable number.

221021211211189 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021211211189 is an equidigital number, since it uses as much as digits as its factorization.

221021211211189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 34.

The spelling of 221021211211189 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred eleven million, two hundred eleven thousand, one hundred eighty-nine".