1211210221211 has 2 divisors, whose sum is σ = 1211210221212. Its totient is φ = 1211210221210.

The previous prime is 1211210221183. The next prime is 1211210221253. The reversal of 1211210221211 is 1121220121121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211210221211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211210221211.

It is not a weakly prime, because it can be changed into another prime (1211210241211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605605110605 + 605605110606.

It is an arithmetic number, because the mean of its divisors is an integer number (605605110606).

Almost surely, 2^{1211210221211} is an apocalyptic number.

1211210221211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211210221211 is an equidigital number, since it uses as much as digits as its factorization.

1211210221211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1211210221211 its reverse (1121220121121), we get a palindrome (2332430342332).

The spelling of 1211210221211 in words is "one trillion, two hundred eleven billion, two hundred ten million, two hundred twenty-one thousand, two hundred eleven".