133055221 has 6 divisors (see below), whose sum is σ = 144077730. Its totient is φ = 122820048.

The previous prime is 133055189. The next prime is 133055239. The reversal of 133055221 is 122550331.

It can be written as a sum of positive squares in 3 ways, for example, as 483025 + 132572196 = 695^2 + 11514^2 .

It is not a de Polignac number, because 133055221 - 2⁵ = 133055189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133055192 and 133055201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133055921) 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 5 ways as a sum of consecutive naturals, for example, 393486 + ... + 393823.

It is an arithmetic number, because the mean of its divisors is an integer number (24012955).

Almost surely, 2^133055221 is an apocalyptic number.

It is an amenable number.

133055221 is a deficient number, since it is larger than the sum of its proper divisors (11022509).

133055221 is an equidigital number, since it uses as much as digits as its factorization.

133055221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787335 (or 787322 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 133055221 is about 11534.9564801953. The cubic root of 133055221 is about 510.5175075048.

The spelling of 133055221 in words is "one hundred thirty-three million, fifty-five thousand, two hundred twenty-one".