1211011222211 has 24 divisors (see below), whose sum is σ = 1415392499520. Its totient is φ = 1033105231872.

The previous prime is 1211011222171. The next prime is 1211011222237. The reversal of 1211011222211 is 1122221101121.

It is a de Polignac number, because none of the positive numbers 2^k-1211011222211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211011222211.

It is not an unprimeable number, because it can be changed into a prime (1211011222261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15235670 + ... + 15314948.

It is an arithmetic number, because the mean of its divisors is an integer number (58974687480).

Almost surely, 2^{1211011222211} is an apocalyptic number.

1211011222211 is a deficient number, since it is larger than the sum of its proper divisors (204381277309).

1211011222211 is a wasteful number, since it uses less digits than its factorization.

1211011222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80763 (or 80756 counting only the distinct ones).

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

Adding to 1211011222211 its reverse (1122221101121), we get a palindrome (2333232323332).

The spelling of 1211011222211 in words is "one trillion, two hundred eleven billion, eleven million, two hundred twenty-two thousand, two hundred eleven".