1221221200211 has 2 divisors, whose sum is σ = 1221221200212. Its totient is φ = 1221221200210.

The previous prime is 1221221200207. The next prime is 1221221200217. The reversal of 1221221200211 is 1120021221221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221221200211 - 2² = 1221221200207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221221200211.

It is not a weakly prime, because it can be changed into another prime (1221221200217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610600105 + 610610600106.

It is an arithmetic number, because the mean of its divisors is an integer number (610610600106).

Almost surely, 2^{1221221200211} is an apocalyptic number.

1221221200211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221221200211 is an equidigital number, since it uses as much as digits as its factorization.

1221221200211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221221200211 its reverse (1120021221221), we get a palindrome (2341242421432).

The spelling of 1221221200211 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred thousand, two hundred eleven".