133221406 has 16 divisors (see below), whose sum is σ = 204503616. Its totient is φ = 65059456.

The previous prime is 133221397. The next prime is 133221409. The reversal of 133221406 is 604122331.

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 in 7 ways as a sum of consecutive naturals, for example, 56850 + ... + 59146.

It is an arithmetic number, because the mean of its divisors is an integer number (12781476).

Almost surely, 2^133221406 is an apocalyptic number.

133221406 is a deficient number, since it is larger than the sum of its proper divisors (71282210).

133221406 is a wasteful number, since it uses less digits than its factorization.

133221406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2963.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 133221406 is about 11542.1577705384. The cubic root of 133221406 is about 510.7299632911.

Adding to 133221406 its reverse (604122331), we get a palindrome (737343737).

The spelling of 133221406 in words is "one hundred thirty-three million, two hundred twenty-one thousand, four hundred six".