1212111111211 has 64 divisors (see below), whose sum is σ = 1645000068096. Its totient is φ = 862461504000.

The previous prime is 1212111111187. The next prime is 1212111111221. The reversal of 1212111111211 is 1121111112121.

It is a cyclic number.

It is not a de Polignac number, because 1212111111211 - 2¹³ = 1212111103019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212111111221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 132134421 + ... + 132143593.

It is an arithmetic number, because the mean of its divisors is an integer number (25703126064).

Almost surely, 2^{1212111111211} is an apocalyptic number.

1212111111211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212111111211 is a deficient number, since it is larger than the sum of its proper divisors (432888956885).

1212111111211 is a wasteful number, since it uses less digits than its factorization.

1212111111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10612.

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

Adding to 1212111111211 its reverse (1121111112121), we get a palindrome (2333222223332).

It can be divided in two parts, 1 and 212111111211, that added together give a palindrome (212111111212).

The spelling of 1212111111211 in words is "one trillion, two hundred twelve billion, one hundred eleven million, one hundred eleven thousand, two hundred eleven".