133321231 has 4 divisors (see below), whose sum is σ = 133344432. Its totient is φ = 133298032.

The previous prime is 133321229. The next prime is 133321267. The reversal of 133321231 is 132123331.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 132123331 = 5197 ⋅25423.

It is a cyclic number.

It is not a de Polignac number, because 133321231 - 2¹ = 133321229 is a prime.

It is a super-2 number, since 2×133321231² = 35549101270710722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133321199 and 133321208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133321211) 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, 4131 + ... + 16843.

It is an arithmetic number, because the mean of its divisors is an integer number (33336108).

Almost surely, 2^133321231 is an apocalyptic number.

133321231 is a deficient number, since it is larger than the sum of its proper divisors (23201).

133321231 is a wasteful number, since it uses less digits than its factorization.

133321231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23200.

The product of its digits is 324, while the sum is 19.

The square root of 133321231 is about 11546.4813254948. The cubic root of 133321231 is about 510.8574975744.

Adding to 133321231 its reverse (132123331), we get a palindrome (265444562).

The spelling of 133321231 in words is "one hundred thirty-three million, three hundred twenty-one thousand, two hundred thirty-one".