133421568 has 80 divisors (see below), whose sum is σ = 406253760. Its totient is φ = 38117376.

The previous prime is 133421557. The next prime is 133421581. The reversal of 133421568 is 865124331.

133421568 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4548 + ... + 16956.

It is an arithmetic number, because the mean of its divisors is an integer number (5078172).

Almost surely, 2^133421568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133421568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203126880).

133421568 is an abundant number, since it is smaller than the sum of its proper divisors (272832192).

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

133421568 is an equidigital number, since it uses as much as digits as its factorization.

133421568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12437 (or 12421 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 133421568 is about 11550.8254250508. The cubic root of 133421568 is about 510.9856218421.

Adding to 133421568 its reverse (865124331), we get a palindrome (998545899).

The spelling of 133421568 in words is "one hundred thirty-three million, four hundred twenty-one thousand, five hundred sixty-eight".