133221131 has 4 divisors (see below), whose sum is σ = 135046152. Its totient is φ = 131396112.

The previous prime is 133221107. The next prime is 133221149. The reversal of 133221131 is 131122331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131122331 = 239 ⋅548629.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133221131 is a prime.

It is a super-2 number, since 2×133221131² = 35495739489838322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133221031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 912401 + ... + 912546.

It is an arithmetic number, because the mean of its divisors is an integer number (33761538).

Almost surely, 2^133221131 is an apocalyptic number.

133221131 is a deficient number, since it is larger than the sum of its proper divisors (1825021).

133221131 is an equidigital number, since it uses as much as digits as its factorization.

133221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825020.

The product of its digits is 108, while the sum is 17.

The square root of 133221131 is about 11542.1458576818. The cubic root of 133221131 is about 510.7296118690.

Adding to 133221131 its reverse (131122331), we get a palindrome (264343462).

The spelling of 133221131 in words is "one hundred thirty-three million, two hundred twenty-one thousand, one hundred thirty-one".