51212 has 24 divisors (see below), whose sum is σ = 107520. Its totient is φ = 20880.

The previous prime is 51203. The next prime is 51217. The reversal of 51212 is 21215.

It is a plaindrome in base 12.

It is a nialpdrome in base 9.

It is a zygodrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 51193 and 51202.

It is not an unprimeable number, because it can be changed into a prime (51217) by changing a digit.

51212 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 839 + ... + 897.

It is an arithmetic number, because the mean of its divisors is an integer number (4480).

2⁵¹²¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53760).

51212 is an abundant number, since it is smaller than the sum of its proper divisors (56308).

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

51212 is a wasteful number, since it uses less digits than its factorization.

51212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 99 counting only the distinct ones).

The product of its digits is 20, while the sum is 11.

The square root of 51212 is about 226.3006849305. The cubic root of 51212 is about 37.1356114353.

Adding to 51212 its reverse (21215), we get a palindrome (72427).

The spelling of 51212 in words is "fifty-one thousand, two hundred twelve".