133221603 has 8 divisors (see below), whose sum is σ = 179027968. Its totient is φ = 88114824.

The previous prime is 133221551. The next prime is 133221617. The reversal of 133221603 is 306122331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 133221603 - 2⁹ = 133221091 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 133221603.

It is not an unprimeable number, because it can be changed into a prime (133221623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174451 + ... + 175212.

It is an arithmetic number, because the mean of its divisors is an integer number (22378496).

Almost surely, 2^133221603 is an apocalyptic number.

133221603 is a deficient number, since it is larger than the sum of its proper divisors (45806365).

133221603 is a wasteful number, since it uses less digits than its factorization.

133221603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349793.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 133221603 is about 11542.1663044682. The cubic root of 133221603 is about 510.7302150368.

Adding to 133221603 its reverse (306122331), we get a palindrome (439343934).

The spelling of 133221603 in words is "one hundred thirty-three million, two hundred twenty-one thousand, six hundred three".