133413221 has 4 divisors (see below), whose sum is σ = 136667244. Its totient is φ = 130159200.

The previous prime is 133413211. The next prime is 133413233. The reversal of 133413221 is 122314331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122314331 = 2239 ⋅54629.

It can be written as a sum of positive squares in 2 ways, for example, as 1852321 + 131560900 = 1361^2 + 11470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133413221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133413193 and 133413202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133413211) 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, 1626950 + ... + 1627031.

It is an arithmetic number, because the mean of its divisors is an integer number (34166811).

Almost surely, 2^133413221 is an apocalyptic number.

It is an amenable number.

133413221 is a deficient number, since it is larger than the sum of its proper divisors (3254023).

133413221 is an equidigital number, since it uses as much as digits as its factorization.

133413221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3254022.

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

The square root of 133413221 is about 11550.4641032298. The cubic root of 133413221 is about 510.9749656791.

Adding to 133413221 its reverse (122314331), we get a palindrome (255727552).

The spelling of 133413221 in words is "one hundred thirty-three million, four hundred thirteen thousand, two hundred twenty-one".