133442421 has 16 divisors (see below), whose sum is σ = 203503104. Its totient is φ = 76191984.

The previous prime is 133442411. The next prime is 133442429. The reversal of 133442421 is 124244331.

It is not a de Polignac number, because 133442421 - 2⁶ = 133442357 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 133442391 and 133442400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133442429) 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 15 ways as a sum of consecutive naturals, for example, 46206 + ... + 49008.

It is an arithmetic number, because the mean of its divisors is an integer number (12718944).

Almost surely, 2^133442421 is an apocalyptic number.

It is an amenable number.

133442421 is a deficient number, since it is larger than the sum of its proper divisors (70060683).

133442421 is a wasteful number, since it uses less digits than its factorization.

133442421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5080.

The product of its digits is 2304, while the sum is 24.

The square root of 133442421 is about 11551.7280525469. The cubic root of 133442421 is about 511.0122417963.

Adding to 133442421 its reverse (124244331), we get a palindrome (257686752).

The spelling of 133442421 in words is "one hundred thirty-three million, four hundred forty-two thousand, four hundred twenty-one".