1221200220211 has 2 divisors, whose sum is σ = 1221200220212. Its totient is φ = 1221200220210.

The previous prime is 1221200220193. The next prime is 1221200220239. The reversal of 1221200220211 is 1120220021221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221200220211 - 2³⁵ = 1186840481843 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221200223211) 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, 610600110105 + 610600110106.

It is an arithmetic number, because the mean of its divisors is an integer number (610600110106).

Almost surely, 2^{1221200220211} is an apocalyptic number.

1221200220211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221200220211 is an equidigital number, since it uses as much as digits as its factorization.

1221200220211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221200220211 its reverse (1120220021221), we get a palindrome (2341420241432).

The spelling of 1221200220211 in words is "one trillion, two hundred twenty-one billion, two hundred million, two hundred twenty thousand, two hundred eleven".