55217214 has 80 divisors (see below), whose sum is σ = 134896608. Its totient is φ = 16780608.

The previous prime is 55217213. The next prime is 55217219. The reversal of 55217214 is 41271255.

55217214 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 (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55217213) 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 39 ways as a sum of consecutive naturals, for example, 330559 + ... + 330725.

Almost surely, 2^55217214 is an apocalyptic number.

55217214 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 55217214, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67448304).

55217214 is an abundant number, since it is smaller than the sum of its proper divisors (79679394).

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

55217214 is a wasteful number, since it uses less digits than its factorization.

55217214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 342 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 55217214 is about 7430.8286213585. The cubic root of 55217214 is about 380.7952275533.

Adding to 55217214 its reverse (41271255), we get a palindrome (96488469).

It can be divided in two parts, 552 and 17214, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 55217214 in words is "fifty-five million, two hundred seventeen thousand, two hundred fourteen".