133421428 has 12 divisors (see below), whose sum is σ = 266842912. Its totient is φ = 57180600.

The previous prime is 133421383. The next prime is 133421437. The reversal of 133421428 is 824124331.

133421428 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 4765051 = 133421428 / (1 + 3 + 3 + 4 + 2 + 1 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 133421396 and 133421405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2382498 + ... + 2382553.

Almost surely, 2^133421428 is an apocalyptic number.

It is an amenable number.

133421428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

133421428 is a wasteful number, since it uses less digits than its factorization.

133421428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4765062 (or 4765060 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 133421428 is about 11550.8193648762. The cubic root of 133421428 is about 510.9854431153.

Adding to 133421428 its reverse (824124331), we get a palindrome (957545759).

The spelling of 133421428 in words is "one hundred thirty-three million, four hundred twenty-one thousand, four hundred twenty-eight".