1211021111211 has 16 divisors (see below), whose sum is σ = 1659520800000. Its totient is φ = 784965614688.

The previous prime is 1211021111207. The next prime is 1211021111221. The reversal of 1211021111211 is 1121111201121.

It is not a de Polignac number, because 1211021111211 - 2² = 1211021111207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211021111221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3743961 + ... + 4054538.

It is an arithmetic number, because the mean of its divisors is an integer number (103720050000).

Almost surely, 2^{1211021111211} is an apocalyptic number.

1211021111211 is a deficient number, since it is larger than the sum of its proper divisors (448499688789).

1211021111211 is a wasteful number, since it uses less digits than its factorization.

1211021111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7799938.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1211021111211 its reverse (1121111201121), we get a palindrome (2332132312332).

The spelling of 1211021111211 in words is "one trillion, two hundred eleven billion, twenty-one million, one hundred eleven thousand, two hundred eleven".