51222 has 8 divisors (see below), whose sum is σ = 102456. Its totient is φ = 17072.

The previous prime is 51217. The next prime is 51229. The reversal of 51222 is 22215.

It is a sphenic number, since it is the product of 3 distinct primes.

51222 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 51198 and 51207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51229) by changing a digit.

51222 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4263 + ... + 4274.

It is an arithmetic number, because the mean of its divisors is an integer number (12807).

2⁵¹²²² is an apocalyptic number.

51222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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 (51228).

51222 is a wasteful number, since it uses less digits than its factorization.

51222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8542.

The product of its digits is 40, while the sum is 12.

The square root of 51222 is about 226.3227783499. The cubic root of 51222 is about 37.1380283945.

Adding to 51222 its reverse (22215), we get a palindrome (73437).

The spelling of 51222 in words is "fifty-one thousand, two hundred twenty-two".