133144021 has 2 divisors, whose sum is σ = 133144022. Its totient is φ = 133144020.

The previous prime is 133143991. The next prime is 133144027. The reversal of 133144021 is 120441331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116424100 + 16719921 = 10790^2 + 4089^2 .

It is an emirp because it is prime and its reverse (120441331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133144021 - 2⁷ = 133143893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133144021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133144027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66572010 + 66572011.

It is an arithmetic number, because the mean of its divisors is an integer number (66572011).

Almost surely, 2^133144021 is an apocalyptic number.

It is an amenable number.

133144021 is a deficient number, since it is larger than the sum of its proper divisors (1).

133144021 is an equidigital number, since it uses as much as digits as its factorization.

133144021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 133144021 is about 11538.8050074520. The cubic root of 133144021 is about 510.6310540280.

Adding to 133144021 its reverse (120441331), we get a palindrome (253585352).

The spelling of 133144021 in words is "one hundred thirty-three million, one hundred forty-four thousand, twenty-one".