133356221 has 2 divisors, whose sum is σ = 133356222. Its totient is φ = 133356220.

The previous prime is 133356217. The next prime is 133356229. The reversal of 133356221 is 122653331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131928196 + 1428025 = 11486^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 133356221 - 2² = 133356217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133356229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66678110 + 66678111.

It is an arithmetic number, because the mean of its divisors is an integer number (66678111).

Almost surely, 2^133356221 is an apocalyptic number.

It is an amenable number.

133356221 is a deficient number, since it is larger than the sum of its proper divisors (1).

133356221 is an equidigital number, since it uses as much as digits as its factorization.

133356221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 26.

The square root of 133356221 is about 11547.9964063036. The cubic root of 133356221 is about 510.9021849813.

The spelling of 133356221 in words is "one hundred thirty-three million, three hundred fifty-six thousand, two hundred twenty-one".