1212113111 has 16 divisors (see below), whose sum is σ = 1355270400. Its totient is φ = 1074534720.

The previous prime is 1212113059. The next prime is 1212113131. The reversal of 1212113111 is 1113112121.

It is a cyclic number.

It is not a de Polignac number, because 1212113111 - 2⁶ = 1212113047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212113131) 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, 349715 + ... + 353163.

It is an arithmetic number, because the mean of its divisors is an integer number (84704400).

Almost surely, 2^1212113111 is an apocalyptic number.

1212113111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212113111 is a deficient number, since it is larger than the sum of its proper divisors (143157289).

1212113111 is a wasteful number, since it uses less digits than its factorization.

1212113111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4246.

The product of its digits is 12, while the sum is 14.

The square root of 1212113111 is about 34815.4148474494. The cubic root of 1212113111 is about 1066.2221889122. Note that the first 3 decimals are identical.

Adding to 1212113111 its reverse (1113112121), we get a palindrome (2325225232).

The spelling of 1212113111 in words is "one billion, two hundred twelve million, one hundred thirteen thousand, one hundred eleven".