133221404 has 6 divisors (see below), whose sum is σ = 233137464. Its totient is φ = 66610700.

The previous prime is 133221397. The next prime is 133221409. The reversal of 133221404 is 404122331.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133221409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16652672 + ... + 16652679.

It is an arithmetic number, because the mean of its divisors is an integer number (38856244).

Almost surely, 2^133221404 is an apocalyptic number.

It is an amenable number.

133221404 is a deficient number, since it is larger than the sum of its proper divisors (99916060).

133221404 is a wasteful number, since it uses less digits than its factorization.

133221404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33305355 (or 33305353 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 133221404 is about 11542.1576838995. The cubic root of 133221404 is about 510.7299607353.

Adding to 133221404 its reverse (404122331), we get a palindrome (537343735).

The spelling of 133221404 in words is "one hundred thirty-three million, two hundred twenty-one thousand, four hundred four".