211212220022209 has 6 divisors (see below), whose sum is σ = 245695847780994. Its totient is φ = 181039045733280.

The previous prime is 211212220022179. The next prime is 211212220022239. The reversal of 211212220022209 is 902220022212112.

It is an interprime number because it is at equal distance from previous prime (211212220022179) and next prime (211212220022239).

It can be written as a sum of positive squares in only one way, i.e., 141200460528400 + 70011759493809 = 11882780^2 + 8367303^2 .

It is not a de Polignac number, because 211212220022209 - 2¹¹ = 211212220020161 is a prime.

It is a super-2 number, since 2×211212220022209² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211212220022239) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2155226734872 + ... + 2155226734969.

It is an arithmetic number, because the mean of its divisors is an integer number (40949307963499).

Almost surely, 2^{211212220022209} is an apocalyptic number.

It is an amenable number.

211212220022209 is a deficient number, since it is larger than the sum of its proper divisors (34483627758785).

211212220022209 is an equidigital number, since it uses as much as digits as its factorization.

211212220022209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310453469855 (or 4310453469848 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The spelling of 211212220022209 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred twenty million, twenty-two thousand, two hundred nine".