133044221 has 4 divisors (see below), whose sum is σ = 136289244. Its totient is φ = 129799200.

The previous prime is 133044217. The next prime is 133044239. The reversal of 133044221 is 122440331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23088025 + 109956196 = 4805^2 + 10486^2 .

It is a cyclic number.

It is not a de Polignac number, because 133044221 - 2² = 133044217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 133044193 and 133044202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133044211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1622450 + ... + 1622531.

It is an arithmetic number, because the mean of its divisors is an integer number (34072311).

Almost surely, 2^133044221 is an apocalyptic number.

It is an amenable number.

133044221 is a deficient number, since it is larger than the sum of its proper divisors (3245023).

133044221 is an equidigital number, since it uses as much as digits as its factorization.

133044221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3245022.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 133044221 is about 11534.4796588316. The cubic root of 133044221 is about 510.5034385407.

Adding to 133044221 its reverse (122440331), we get a palindrome (255484552).

The spelling of 133044221 in words is "one hundred thirty-three million, forty-four thousand, two hundred twenty-one".