55212 has 24 divisors (see below), whose sum is σ = 133056. Its totient is φ = 17808.
The previous prime is 55207. The next prime is 55213. The reversal of 55212 is 21255.
It is a plaindrome in base 15.
It is a junction number, because it is equal to n+sod(n) for n = 55191 and 55200.
It is not an unprimeable number, because it can be changed into a prime (55213) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 463 + ... + 569.
It is an arithmetic number, because the mean of its divisors is an integer number (5544).
255212 is an apocalyptic number.
It is an amenable number.
55212 is an abundant number, since it is smaller than the sum of its proper divisors (77844).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66528).
55212 is a wasteful number, since it uses less digits than its factorization.
55212 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 157 (or 155 counting only the distinct ones).
The product of its digits is 100, while the sum is 15.
The square root of 55212 is about 234.9723387976. The cubic root of 55212 is about 38.0783241383.
Adding to 55212 its reverse (21255), we get a palindrome (76467).
The spelling of 55212 in words is "fifty-five thousand, two hundred twelve".
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