133121121 has 16 divisors (see below), whose sum is σ = 205632384. Its totient is φ = 75026304.

The previous prime is 133121111. The next prime is 133121123. The reversal of 133121121 is 121121331.

It is a happy number.

It is not a de Polignac number, because 133121121 - 2⁷ = 133120993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133121121.

It is not an unprimeable number, because it can be changed into a prime (133121123) 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, 41886 + ... + 44951.

It is an arithmetic number, because the mean of its divisors is an integer number (12852024).

Almost surely, 2^133121121 is an apocalyptic number.

It is an amenable number.

133121121 is a deficient number, since it is larger than the sum of its proper divisors (72511263).

133121121 is an equidigital number, since it uses as much as digits as its factorization.

133121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86920.

The product of its digits is 36, while the sum is 15.

The square root of 133121121 is about 11537.8126609856. The cubic root of 133121121 is about 510.6017771554.

Adding to 133121121 its reverse (121121331), we get a palindrome (254242452).

The spelling of 133121121 in words is "one hundred thirty-three million, one hundred twenty-one thousand, one hundred twenty-one".