133121436 has 36 divisors (see below), whose sum is σ = 361331208. Its totient is φ = 38034528.

The previous prime is 133121431. The next prime is 133121453. The reversal of 133121436 is 634121331.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133121431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112611 + ... + 113786.

It is an arithmetic number, because the mean of its divisors is an integer number (10036978).

Almost surely, 2^133121436 is an apocalyptic number.

It is an amenable number.

133121436 is an abundant number, since it is smaller than the sum of its proper divisors (228209772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133121436 is a wasteful number, since it uses less digits than its factorization.

133121436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226418 (or 226409 counting only the distinct ones).

The product of its digits is 1296, while the sum is 24.

The square root of 133121436 is about 11537.8263117452. The cubic root of 133121436 is about 510.6021798950.

Adding to 133121436 its reverse (634121331), we get a palindrome (767242767).

The spelling of 133121436 in words is "one hundred thirty-three million, one hundred twenty-one thousand, four hundred thirty-six".