133204121 has 6 divisors (see below), whose sum is σ = 136533966. Its totient is φ = 129953600.

The previous prime is 133204091. The next prime is 133204139. The reversal of 133204121 is 121402331.

It can be written as a sum of positive squares in 3 ways, for example, as 1849600 + 131354521 = 1360^2 + 11461^2 .

It is a de Polignac number, because none of the positive numbers 2^k-133204121 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 133204121.

It is not an unprimeable number, because it can be changed into a prime (133204151) 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 5 ways as a sum of consecutive naturals, for example, 37940 + ... + 41301.

It is an arithmetic number, because the mean of its divisors is an integer number (22755661).

Almost surely, 2^133204121 is an apocalyptic number.

It is an amenable number.

133204121 is a deficient number, since it is larger than the sum of its proper divisors (3329845).

133204121 is an frugal number, since it uses more digits than its factorization.

133204121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79323 (or 79282 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 133204121 is about 11541.4089694456. The cubic root of 133204121 is about 510.7078738749.

Adding to 133204121 its reverse (121402331), we get a palindrome (254606452).

The spelling of 133204121 in words is "one hundred thirty-three million, two hundred four thousand, one hundred twenty-one".