12212133 has 4 divisors (see below), whose sum is σ = 16282848.
Its totient is φ = 8141420.
The previous prime is 12212131. The next prime is 12212141. The reversal of 12212133 is 33121221.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 12212133 - 21 = 12212131 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (12212131) 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, 2035353 + ... + 2035358.
It is an arithmetic number, because the mean of its divisors is an integer number (4070712).
Almost surely, 212212133 is an apocalyptic number.
It is an amenable number.
12212133 is a deficient number, since it is larger than the sum of its proper divisors (4070715).
12212133 is an equidigital number, since it uses as much as digits as its factorization.
12212133 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4070714.
The product of its digits is 72, while the sum is 15.
The square root of 12212133 is about 3494.5862416029.
The cubic root of 12212133 is about 230.2840410105.
Adding to 12212133 its reverse (33121221), we get a palindrome (45333354).
The spelling of 12212133 in words is "twelve million, two hundred twelve thousand, one hundred thirty-three".