133221505 has 16 divisors (see below), whose sum is σ = 169419600. Its totient is φ = 100387840.

The previous prime is 133221493. The next prime is 133221509. The reversal of 133221505 is 505122331.

It can be written as a sum of positive squares in 8 ways, for example, as 12397441 + 120824064 = 3521^2 + 10992^2 .

It is not a de Polignac number, because 133221505 - 2¹⁹ = 132697217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133221509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5260 + ... + 17149.

It is an arithmetic number, because the mean of its divisors is an integer number (10588725).

Almost surely, 2^133221505 is an apocalyptic number.

It is an amenable number.

133221505 is a deficient number, since it is larger than the sum of its proper divisors (36198095).

133221505 is a wasteful number, since it uses less digits than its factorization.

133221505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22484.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 133221505 is about 11542.1620591638. The cubic root of 133221505 is about 510.7300898029.

Adding to 133221505 its reverse (505122331), we get a palindrome (638343836).

The spelling of 133221505 in words is "one hundred thirty-three million, two hundred twenty-one thousand, five hundred five".