121242133 has 4 divisors (see below), whose sum is σ = 121331308. Its totient is φ = 121152960.

The previous prime is 121242101. The next prime is 121242137. The reversal of 121242133 is 331242121.

It is a happy number.

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 16834609 + 104407524 = 4103^2 + 10218^2 .

It is a cyclic number.

It is not a de Polignac number, because 121242133 - 2⁵ = 121242101 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 121242133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121242137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42516 + ... + 45277.

It is an arithmetic number, because the mean of its divisors is an integer number (30332827).

Almost surely, 2^121242133 is an apocalyptic number.

It is an amenable number.

121242133 is a deficient number, since it is larger than the sum of its proper divisors (89175).

121242133 is an equidigital number, since it uses as much as digits as its factorization.

121242133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89174.

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

The square root of 121242133 is about 11011.0005449096. Note that the first 3 decimals coincide. The cubic root of 121242133 is about 494.9384448846.

Adding to 121242133 its reverse (331242121), we get a palindrome (452484254).

The spelling of 121242133 in words is "one hundred twenty-one million, two hundred forty-two thousand, one hundred thirty-three".