55215222 has 8 divisors (see below), whose sum is σ = 110430456. Its totient is φ = 18405072.

The previous prime is 55215179. The next prime is 55215239. The reversal of 55215222 is 22251255.

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

55215222 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 55215192 and 55215201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4601263 + ... + 4601274.

It is an arithmetic number, because the mean of its divisors is an integer number (13803807).

Almost surely, 2^55215222 is an apocalyptic number.

55215222 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.

55215222 is a wasteful number, since it uses less digits than its factorization.

55215222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9202542.

The product of its digits is 2000, while the sum is 24.

The square root of 55215222 is about 7430.6945839538. The cubic root of 55215222 is about 380.7906483460.

Adding to 55215222 its reverse (22251255), we get a palindrome (77466477).

The spelling of 55215222 in words is "fifty-five million, two hundred fifteen thousand, two hundred twenty-two".