133221431 has 8 divisors (see below), whose sum is σ = 152342400. Its totient is φ = 114122808.

The previous prime is 133221427. The next prime is 133221433. The reversal of 133221431 is 134122331.

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

It is a cyclic number.

It is not a de Polignac number, because 133221431 - 2² = 133221427 is a prime.

It is a super-2 number, since 2×133221431² = 35495899355375522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133221433) 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, 10160 + ... + 19226.

It is an arithmetic number, because the mean of its divisors is an integer number (19042800).

Almost surely, 2^133221431 is an apocalyptic number.

133221431 is a deficient number, since it is larger than the sum of its proper divisors (19120969).

133221431 is an equidigital number, since it uses as much as digits as its factorization.

133221431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11173.

The product of its digits is 432, while the sum is 20.

The square root of 133221431 is about 11542.1588535248. The cubic root of 133221431 is about 510.7299952385.

Adding to 133221431 its reverse (134122331), we get a palindrome (267343762).

The spelling of 133221431 in words is "one hundred thirty-three million, two hundred twenty-one thousand, four hundred thirty-one".