133444221 has 4 divisors (see below), whose sum is σ = 177925632. Its totient is φ = 88962812.

The previous prime is 133444211. The next prime is 133444261. The reversal of 133444221 is 122444331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133444221 - 2¹⁴ = 133427837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 133444191 and 133444200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133444211) 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 3 ways as a sum of consecutive naturals, for example, 22240701 + ... + 22240706.

It is an arithmetic number, because the mean of its divisors is an integer number (44481408).

Almost surely, 2^133444221 is an apocalyptic number.

It is an amenable number.

133444221 is a deficient number, since it is larger than the sum of its proper divisors (44481411).

133444221 is an equidigital number, since it uses as much as digits as its factorization.

133444221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44481410.

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

The square root of 133444221 is about 11551.8059627056. The cubic root of 133444221 is about 511.0145394612.

Adding to 133444221 its reverse (122444331), we get a palindrome (255888552).

The spelling of 133444221 in words is "one hundred thirty-three million, four hundred forty-four thousand, two hundred twenty-one".