1211111112211 has 16 divisors (see below), whose sum is σ = 1626107228928. Its totient is φ = 871128871200.

The previous prime is 1211111112209. The next prime is 1211111112257. The reversal of 1211111112211 is 1122111111121.

It is not a de Polignac number, because 1211111112211 - 2¹ = 1211111112209 is a prime.

It is a super-2 number, since 2×1211111112211² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211111112011) 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, 604949605 + ... + 604951606.

It is an arithmetic number, because the mean of its divisors is an integer number (101631701808).

Almost surely, 2^{1211111112211} is an apocalyptic number.

1211111112211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211111112211 is a deficient number, since it is larger than the sum of its proper divisors (414996116717).

1211111112211 is a wasteful number, since it uses less digits than its factorization.

1211111112211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209901242.

The product of its digits is 8, while the sum is 16.

Adding to 1211111112211 its reverse (1122111111121), we get a palindrome (2333222223332).

The spelling of 1211111112211 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one hundred twelve thousand, two hundred eleven".