133121405 has 16 divisors (see below), whose sum is σ = 163425600. Its totient is φ = 104065920.

The previous prime is 133121389. The next prime is 133121431. The reversal of 133121405 is 504121331.

It is not a de Polignac number, because 133121405 - 2⁴ = 133121389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51545 + ... + 54065.

It is an arithmetic number, because the mean of its divisors is an integer number (10214100).

Almost surely, 2^133121405 is an apocalyptic number.

It is an amenable number.

133121405 is a deficient number, since it is larger than the sum of its proper divisors (30304195).

133121405 is a wasteful number, since it uses less digits than its factorization.

133121405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2764.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 133121405 is about 11537.8249683378. The cubic root of 133121405 is about 510.6021402604.

Adding to 133121405 its reverse (504121331), we get a palindrome (637242736).

The spelling of 133121405 in words is "one hundred thirty-three million, one hundred twenty-one thousand, four hundred five".