133443421 has 8 divisors (see below), whose sum is σ = 141394680. Its totient is φ = 125503488.

The previous prime is 133443407. The next prime is 133443433. The reversal of 133443421 is 124344331.

It can be written as a sum of positive squares in 4 ways, for example, as 57927321 + 75516100 = 7611^2 + 8690^2 .

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 133443421 - 2¹³ = 133435229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133443451) 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, 40525 + ... + 43693.

It is an arithmetic number, because the mean of its divisors is an integer number (17674335).

Almost surely, 2^133443421 is an apocalyptic number.

It is an amenable number.

133443421 is a deficient number, since it is larger than the sum of its proper divisors (7951259).

133443421 is a wasteful number, since it uses less digits than its factorization.

133443421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5663.

The product of its digits is 3456, while the sum is 25.

The square root of 133443421 is about 11551.7713360333. The cubic root of 133443421 is about 511.0135182793.

Adding to 133443421 its reverse (124344331), we get a palindrome (257787752).

The spelling of 133443421 in words is "one hundred thirty-three million, four hundred forty-three thousand, four hundred twenty-one".