128421133 has 8 divisors (see below), whose sum is σ = 136044320. Its totient is φ = 120884400.

The previous prime is 128421131. The next prime is 128421149. The reversal of 128421133 is 331124821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128421133 - 2¹ = 128421131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128421098 and 128421107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128421131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18543 + ... + 24508.

It is an arithmetic number, because the mean of its divisors is an integer number (17005540).

Almost surely, 2^128421133 is an apocalyptic number.

It is an amenable number.

128421133 is a deficient number, since it is larger than the sum of its proper divisors (7623187).

128421133 is a wasteful number, since it uses less digits than its factorization.

128421133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43227.

The product of its digits is 1152, while the sum is 25.

The square root of 128421133 is about 11332.3048405874. The cubic root of 128421133 is about 504.5205173431.

Adding to 128421133 its reverse (331124821), we get a palindrome (459545954).

The spelling of 128421133 in words is "one hundred twenty-eight million, four hundred twenty-one thousand, one hundred thirty-three".