1212111111 has 8 divisors (see below), whose sum is σ = 1630450800. Its totient is φ = 800922752.

The previous prime is 1212111097. The next prime is 1212111119. The reversal of 1212111111 is 1111112121.

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 1212111111 - 2¹⁰ = 1212110087 is a prime.

1212111111 is a modest number, since divided by 111111 gives 1212 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212111119) 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, 1787436 + ... + 1788113.

It is an arithmetic number, because the mean of its divisors is an integer number (203806350).

Almost surely, 2^1212111111 is an apocalyptic number.

1212111111 is a deficient number, since it is larger than the sum of its proper divisors (418339689).

1212111111 is a wasteful number, since it uses less digits than its factorization.

1212111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3575665.

The product of its digits is 4, while the sum is 12.

The square root of 1212111111 is about 34815.3861245283. The cubic root of 1212111111 is about 1066.2216024857.

Adding to 1212111111 its reverse (1111112121), we get a palindrome (2323223232).

It can be divided in two parts, 12121 and 11111, that multiplied together give a palindrome (134676431).

The spelling of 1212111111 in words is "one billion, two hundred twelve million, one hundred eleven thousand, one hundred eleven".