133312212 has 72 divisors (see below), whose sum is σ = 376215840. Its totient is φ = 39453120.

The previous prime is 133312199. The next prime is 133312213. The reversal of 133312212 is 212213331.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133312213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13114 + ... + 20942.

It is an arithmetic number, because the mean of its divisors is an integer number (5225220).

Almost surely, 2^133312212 is an apocalyptic number.

133312212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133312212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188107920).

133312212 is an abundant number, since it is smaller than the sum of its proper divisors (242903628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133312212 is a wasteful number, since it uses less digits than its factorization.

133312212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7893 (or 7888 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 133312212 is about 11546.0907670085. The cubic root of 133312212 is about 510.8459777096.

Adding to 133312212 its reverse (212213331), we get a palindrome (345525543).

The spelling of 133312212 in words is "one hundred thirty-three million, three hundred twelve thousand, two hundred twelve".