1221450211 has 2 divisors, whose sum is σ = 1221450212. Its totient is φ = 1221450210.

The previous prime is 1221450203. The next prime is 1221450227. The reversal of 1221450211 is 1120541221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221450211 - 2³ = 1221450203 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221450281) 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, 610725105 + 610725106.

It is an arithmetic number, because the mean of its divisors is an integer number (610725106).

Almost surely, 2^1221450211 is an apocalyptic number.

1221450211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221450211 is an equidigital number, since it uses as much as digits as its factorization.

1221450211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1221450211 is about 34949.2519376309. The cubic root of 1221450211 is about 1068.9529487211.

Adding to 1221450211 its reverse (1120541221), we get a palindrome (2341991432).

The spelling of 1221450211 in words is "one billion, two hundred twenty-one million, four hundred fifty thousand, two hundred eleven".