55120212 has 72 divisors (see below), whose sum is σ = 162279936. Its totient is φ = 15447744.

The previous prime is 55120189. The next prime is 55120283. The reversal of 55120212 is 21202155.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11293 + ... + 15419.

It is an arithmetic number, because the mean of its divisors is an integer number (2253888).

Almost surely, 2^55120212 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 55120212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81139968).

55120212 is an abundant number, since it is smaller than the sum of its proper divisors (107159724).

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

55120212 is a wasteful number, since it uses less digits than its factorization.

55120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4197 (or 4192 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 55120212 is about 7424.2987547647. The cubic root of 55120212 is about 380.5721114442.

Adding to 55120212 its reverse (21202155), we get a palindrome (76322367).

The spelling of 55120212 in words is "fifty-five million, one hundred twenty thousand, two hundred twelve".