21211112022209 has 2 divisors, whose sum is σ = 21211112022210. Its totient is φ = 21211112022208.

The previous prime is 21211112022169. The next prime is 21211112022227. The reversal of 21211112022209 is 90222021111212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19699572096400 + 1511539925809 = 4438420^2 + 1229447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211112022209 is a prime.

It is a super-2 number, since 2×21211112022209² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21211112022229) 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, 10605556011104 + 10605556011105.

It is an arithmetic number, because the mean of its divisors is an integer number (10605556011105).

Almost surely, 2^{21211112022209} is an apocalyptic number.

It is an amenable number.

21211112022209 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211112022209 is an equidigital number, since it uses as much as digits as its factorization.

21211112022209 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 26.

The spelling of 21211112022209 in words is "twenty-one trillion, two hundred eleven billion, one hundred twelve million, twenty-two thousand, two hundred nine".