133303213 has 4 divisors (see below), whose sum is σ = 133327260. Its totient is φ = 133279168.

The previous prime is 133303211. The next prime is 133303217. The reversal of 133303213 is 312303331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 110292004 + 23011209 = 10502^2 + 4797^2 .

It is a cyclic number.

It is not a de Polignac number, because 133303213 - 2¹ = 133303211 is a prime.

It is a super-2 number, since 2×133303213² = 35539493192246738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133303211) 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, 981 + ... + 16357.

It is an arithmetic number, because the mean of its divisors is an integer number (33331815).

Almost surely, 2^133303213 is an apocalyptic number.

It is an amenable number.

133303213 is a deficient number, since it is larger than the sum of its proper divisors (24047).

133303213 is an equidigital number, since it uses as much as digits as its factorization.

133303213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24046.

The product of its (nonzero) digits is 486, while the sum is 19.

The square root of 133303213 is about 11545.7010614341. The cubic root of 133303213 is about 510.8344828727.

Adding to 133303213 its reverse (312303331), we get a palindrome (445606544).

The spelling of 133303213 in words is "one hundred thirty-three million, three hundred three thousand, two hundred thirteen".