55421212 has 24 divisors (see below), whose sum is σ = 120919680. Its totient is φ = 21592560.

The previous prime is 55421209. The next prime is 55421213. The reversal of 55421212 is 21212455.

55421212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55421213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89662 + ... + 90277.

It is an arithmetic number, because the mean of its divisors is an integer number (5038320).

Almost surely, 2^55421212 is an apocalyptic number.

It is an amenable number.

55421212 is an abundant number, since it is smaller than the sum of its proper divisors (65498468).

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

55421212 is a wasteful number, since it uses less digits than its factorization.

55421212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179961 (or 179959 counting only the distinct ones).

The product of its digits is 800, while the sum is 22.

The square root of 55421212 is about 7444.5424305326. The cubic root of 55421212 is about 381.2635959677.

Adding to 55421212 its reverse (21212455), we get a palindrome (76633667).

The spelling of 55421212 in words is "fifty-five million, four hundred twenty-one thousand, two hundred twelve".