20212211222209 has 2 divisors, whose sum is σ = 20212211222210. Its totient is φ = 20212211222208.

The previous prime is 20212211222183. The next prime is 20212211222237. The reversal of 20212211222209 is 90222211221202.

It is an a-pointer prime, because the next prime (20212211222237) can be obtained adding 20212211222209 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12151694021184 + 8060517201025 = 3485928^2 + 2839105^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212211222209 - 2⁷ = 20212211222081 is a prime.

It is a super-4 number, since 4×20212211222209⁴ (a number of 54 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (20212211222299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106105611104 + 10106105611105.

It is an arithmetic number, because the mean of its divisors is an integer number (10106105611105).

Almost surely, 2^{20212211222209} is an apocalyptic number.

It is an amenable number.

20212211222209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212211222209 is an equidigital number, since it uses as much as digits as its factorization.

20212211222209 is an evil number, because the sum of its binary digits is even.

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

The spelling of 20212211222209 in words is "twenty trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty-two thousand, two hundred nine".