1212112133 has 4 divisors (see below), whose sum is σ = 1212503628. Its totient is φ = 1211720640.

The previous prime is 1212112129. The next prime is 1212112177. The reversal of 1212112133 is 3312112121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 196925089 + 1015187044 = 14033^2 + 31862^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212112133 - 2² = 1212112129 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 (1212612133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191066 + ... + 197307.

It is an arithmetic number, because the mean of its divisors is an integer number (303125907).

Almost surely, 2^1212112133 is an apocalyptic number.

It is an amenable number.

1212112133 is a deficient number, since it is larger than the sum of its proper divisors (391495).

1212112133 is an equidigital number, since it uses as much as digits as its factorization.

1212112133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391494.

The product of its digits is 72, while the sum is 17.

The square root of 1212112133 is about 34815.4008019440. The cubic root of 1212112133 is about 1066.2219021497.

Adding to 1212112133 its reverse (3312112121), we get a palindrome (4524224254).

The spelling of 1212112133 in words is "one billion, two hundred twelve million, one hundred twelve thousand, one hundred thirty-three".