2211111021209 has 2 divisors, whose sum is σ = 2211111021210. Its totient is φ = 2211111021208.

The previous prime is 2211111021151. The next prime is 2211111021271. The reversal of 2211111021209 is 9021201111122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1451851485184 + 759259536025 = 1204928^2 + 871355^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211111021209 - 2²⁸ = 2210842585753 is a prime.

It is a super-2 number, since 2×2211111021209² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2211111021109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105555510604 + 1105555510605.

It is an arithmetic number, because the mean of its divisors is an integer number (1105555510605).

Almost surely, 2^{2211111021209} is an apocalyptic number.

It is an amenable number.

2211111021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211111021209 is an equidigital number, since it uses as much as digits as its factorization.

2211111021209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 2211111021209 in words is "two trillion, two hundred eleven billion, one hundred eleven million, twenty-one thousand, two hundred nine".