133776221 has 2 divisors, whose sum is σ = 133776222. Its totient is φ = 133776220.

The previous prime is 133776161. The next prime is 133776263. The reversal of 133776221 is 122677331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129732100 + 4044121 = 11390^2 + 2011^2 .

It is a cyclic number.

It is not a de Polignac number, because 133776221 - 2⁶ = 133776157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133779221) 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 as a sum of consecutive naturals, namely, 66888110 + 66888111.

It is an arithmetic number, because the mean of its divisors is an integer number (66888111).

Almost surely, 2^133776221 is an apocalyptic number.

It is an amenable number.

133776221 is a deficient number, since it is larger than the sum of its proper divisors (1).

133776221 is an equidigital number, since it uses as much as digits as its factorization.

133776221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 32.

The square root of 133776221 is about 11566.1670833513. The cubic root of 133776221 is about 511.4379781130.

The spelling of 133776221 in words is "one hundred thirty-three million, seven hundred seventy-six thousand, two hundred twenty-one".