133143221 has 2 divisors, whose sum is σ = 133143222. Its totient is φ = 133143220.

The previous prime is 133143217. The next prime is 133143239. The reversal of 133143221 is 122341331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116942596 + 16200625 = 10814^2 + 4025^2 .

It is a cyclic number.

It is not a de Polignac number, because 133143221 - 2² = 133143217 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 133143193 and 133143202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133143121) 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, 66571610 + 66571611.

It is an arithmetic number, because the mean of its divisors is an integer number (66571611).

Almost surely, 2^133143221 is an apocalyptic number.

It is an amenable number.

133143221 is a deficient number, since it is larger than the sum of its proper divisors (1).

133143221 is an equidigital number, since it uses as much as digits as its factorization.

133143221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 20.

The square root of 133143221 is about 11538.7703417652. The cubic root of 133143221 is about 510.6300313117.

Adding to 133143221 its reverse (122341331), we get a palindrome (255484552).

The spelling of 133143221 in words is "one hundred thirty-three million, one hundred forty-three thousand, two hundred twenty-one".