133423521 has 48 divisors (see below), whose sum is σ = 228127680. Its totient is φ = 68584320.

The previous prime is 133423513. The next prime is 133423541. The reversal of 133423521 is 125324331.

It is not a de Polignac number, because 133423521 - 2³ = 133423513 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 133423491 and 133423500.

It is not an unprimeable number, because it can be changed into a prime (133423501) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 175875 + ... + 176631.

It is an arithmetic number, because the mean of its divisors is an integer number (4752660).

Almost surely, 2^133423521 is an apocalyptic number.

133423521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133423521 is a deficient number, since it is larger than the sum of its proper divisors (94704159).

133423521 is a wasteful number, since it uses less digits than its factorization.

133423521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894 (or 887 counting only the distinct ones).

The product of its digits is 2160, while the sum is 24.

The square root of 133423521 is about 11550.9099641543. The cubic root of 133423521 is about 510.9881150673.

Adding to 133423521 its reverse (125324331), we get a palindrome (258747852).

The spelling of 133423521 in words is "one hundred thirty-three million, four hundred twenty-three thousand, five hundred twenty-one".