133221373 has 2 divisors, whose sum is σ = 133221374. Its totient is φ = 133221372.

The previous prime is 133221371. The next prime is 133221397. The reversal of 133221373 is 373122331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127848249 + 5373124 = 11307^2 + 2318^2 .

It is a cyclic number.

It is not a de Polignac number, because 133221373 - 2¹ = 133221371 is a prime.

Together with 133221371, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133221371) 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, 66610686 + 66610687.

It is an arithmetic number, because the mean of its divisors is an integer number (66610687).

Almost surely, 2^133221373 is an apocalyptic number.

It is an amenable number.

133221373 is a deficient number, since it is larger than the sum of its proper divisors (1).

133221373 is an equidigital number, since it uses as much as digits as its factorization.

133221373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 25.

The square root of 133221373 is about 11542.1563409963. The cubic root of 133221373 is about 510.7299211205.

The spelling of 133221373 in words is "one hundred thirty-three million, two hundred twenty-one thousand, three hundred seventy-three".