21011221022189 has 2 divisors, whose sum is σ = 21011221022190. Its totient is φ = 21011221022188.

The previous prime is 21011221022149. The next prime is 21011221022219. The reversal of 21011221022189 is 98122012211012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10540444026025 + 10470776996164 = 3246605^2 + 3235858^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011221022189 - 2¹² = 21011221018093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011221022149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505610511094 + 10505610511095.

It is an arithmetic number, because the mean of its divisors is an integer number (10505610511095).

Almost surely, 2^{21011221022189} is an apocalyptic number.

It is an amenable number.

21011221022189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011221022189 is an equidigital number, since it uses as much as digits as its factorization.

21011221022189 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 32.

The spelling of 21011221022189 in words is "twenty-one trillion, eleven billion, two hundred twenty-one million, twenty-two thousand, one hundred eighty-nine".