121212433 has 4 divisors (see below), whose sum is σ = 121273920. Its totient is φ = 121150948.

The previous prime is 121212391. The next prime is 121212439. The reversal of 121212433 is 334212121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121212433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121212433.

It is not an unprimeable number, because it can be changed into a prime (121212439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27685 + ... + 31762.

It is an arithmetic number, because the mean of its divisors is an integer number (30318480).

Almost surely, 2^121212433 is an apocalyptic number.

It is an amenable number.

121212433 is a deficient number, since it is larger than the sum of its proper divisors (61487).

121212433 is an equidigital number, since it uses as much as digits as its factorization.

121212433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61486.

The product of its digits is 288, while the sum is 19.

The square root of 121212433 is about 11009.6518110247. The cubic root of 121212433 is about 494.8980274930.

Adding to 121212433 its reverse (334212121), we get a palindrome (455424554).

The spelling of 121212433 in words is "one hundred twenty-one million, two hundred twelve thousand, four hundred thirty-three".