21222120201109 has 2 divisors, whose sum is σ = 21222120201110. Its totient is φ = 21222120201108.

The previous prime is 21222120201097. The next prime is 21222120201119. The reversal of 21222120201109 is 90110202122212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19989420728209 + 1232699472900 = 4470953^2 + 1110270^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222120201109 - 2¹⁵ = 21222120168341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222120201119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611060100554 + 10611060100555.

It is an arithmetic number, because the mean of its divisors is an integer number (10611060100555).

Almost surely, 2^{21222120201109} is an apocalyptic number.

It is an amenable number.

21222120201109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222120201109 is an equidigital number, since it uses as much as digits as its factorization.

21222120201109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 21222120201109 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, two hundred one thousand, one hundred nine".