133243321 has 4 divisors (see below), whose sum is σ = 133395444. Its totient is φ = 133091200.

The previous prime is 133243309. The next prime is 133243351. The reversal of 133243321 is 123342331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123342331 = 7 ⋅17620333.

It can be written as a sum of positive squares in 2 ways, for example, as 19927296 + 113316025 = 4464^2 + 10645^2 .

It is a cyclic number.

It is not a de Polignac number, because 133243321 - 2⁵ = 133243289 is a prime.

It is a super-2 number, since 2×133243321² = 35507565182218082, 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 = 133243292 and 133243301.

It is not an unprimeable number, because it can be changed into a prime (133243351) 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, 74740 + ... + 76501.

It is an arithmetic number, because the mean of its divisors is an integer number (33348861).

Almost surely, 2^133243321 is an apocalyptic number.

It is an amenable number.

133243321 is a deficient number, since it is larger than the sum of its proper divisors (152123).

133243321 is an equidigital number, since it uses as much as digits as its factorization.

133243321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152122.

The product of its digits is 1296, while the sum is 22.

The square root of 133243321 is about 11543.1070773861. The cubic root of 133243321 is about 510.7579668825.

Adding to 133243321 its reverse (123342331), we get a palindrome (256585652).

The spelling of 133243321 in words is "one hundred thirty-three million, two hundred forty-three thousand, three hundred twenty-one".