1212201211111 has 8 divisors (see below), whose sum is σ = 1325854070784. Its totient is φ = 1099123809720.

The previous prime is 1212201211087. The next prime is 1212201211153. The reversal of 1212201211111 is 1111121022121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212201211111 - 2³⁹ = 662445397223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212201211181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143860161 + ... + 143868586.

It is an arithmetic number, because the mean of its divisors is an integer number (165731758848).

Almost surely, 2^{1212201211111} is an apocalyptic number.

1212201211111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212201211111 is a deficient number, since it is larger than the sum of its proper divisors (113652859673).

1212201211111 is a wasteful number, since it uses less digits than its factorization.

1212201211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287729141.

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

Adding to 1212201211111 its reverse (1111121022121), we get a palindrome (2323322233232).

It can be divided in two parts, 121220 and 1211111, that added together give a palindrome (1332331).

The spelling of 1212201211111 in words is "one trillion, two hundred twelve billion, two hundred one million, two hundred eleven thousand, one hundred eleven".