1211002221211 has 4 divisors (see below), whose sum is σ = 1250066809024. Its totient is φ = 1171937633400.

The previous prime is 1211002221199. The next prime is 1211002221227. The reversal of 1211002221211 is 1121222001121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211002221211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211002221281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19532293860 + ... + 19532293921.

It is an arithmetic number, because the mean of its divisors is an integer number (312516702256).

Almost surely, 2^{1211002221211} is an apocalyptic number.

1211002221211 is a deficient number, since it is larger than the sum of its proper divisors (39064587813).

1211002221211 is an equidigital number, since it uses as much as digits as its factorization.

1211002221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39064587812.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211002221211 its reverse (1121222001121), we get a palindrome (2332224222332).

The spelling of 1211002221211 in words is "one trillion, two hundred eleven billion, two million, two hundred twenty-one thousand, two hundred eleven".