1211011220211 has 16 divisors (see below), whose sum is σ = 1739015406240. Its totient is φ = 745183031040.

The previous prime is 1211011220173. The next prime is 1211011220267. The reversal of 1211011220211 is 1120221101121.

It is a happy number.

It is not a de Polignac number, because 1211011220211 - 2¹¹ = 1211011218163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211011220611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 596416 + ... + 1666653.

It is an arithmetic number, because the mean of its divisors is an integer number (108688462890).

Almost surely, 2^{1211011220211} is an apocalyptic number.

1211011220211 is a deficient number, since it is larger than the sum of its proper divisors (528004186029).

1211011220211 is a wasteful number, since it uses less digits than its factorization.

1211011220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2276806.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211011220211 its reverse (1120221101121), we get a palindrome (2331232321332).

The spelling of 1211011220211 in words is "one trillion, two hundred eleven billion, eleven million, two hundred twenty thousand, two hundred eleven".