133466821 has 2 divisors, whose sum is σ = 133466822. Its totient is φ = 133466820.

The previous prime is 133466783. The next prime is 133466831. The reversal of 133466821 is 128664331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116942596 + 16524225 = 10814^2 + 4065^2 .

It is a cyclic number.

It is not a de Polignac number, because 133466821 - 2²⁵ = 99912389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133466831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66733410 + 66733411.

It is an arithmetic number, because the mean of its divisors is an integer number (66733411).

Almost surely, 2^133466821 is an apocalyptic number.

It is an amenable number.

133466821 is a deficient number, since it is larger than the sum of its proper divisors (1).

133466821 is an equidigital number, since it uses as much as digits as its factorization.

133466821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The square root of 133466821 is about 11552.7841233185. The cubic root of 133466821 is about 511.0433861623.

The spelling of 133466821 in words is "one hundred thirty-three million, four hundred sixty-six thousand, eight hundred twenty-one".