1220211211 has 2 divisors, whose sum is σ = 1220211212. Its totient is φ = 1220211210.

The previous prime is 1220211191. The next prime is 1220211229. The reversal of 1220211211 is 1121120221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220211211 - 2¹¹ = 1220209163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220211191 and 1220211200.

It is not a weakly prime, because it can be changed into another prime (1220211241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610105605 + 610105606.

It is an arithmetic number, because the mean of its divisors is an integer number (610105606).

Almost surely, 2^1220211211 is an apocalyptic number.

1220211211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220211211 is an equidigital number, since it uses as much as digits as its factorization.

1220211211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1220211211 is about 34931.5217389681. The cubic root of 1220211211 is about 1068.5913892227.

Adding to 1220211211 its reverse (1121120221), we get a palindrome (2341331432).

The spelling of 1220211211 in words is "one billion, two hundred twenty million, two hundred eleven thousand, two hundred eleven".