55320213 has 16 divisors (see below), whose sum is σ = 81998336. Its totient is φ = 32944320.

The previous prime is 55320211. The next prime is 55320233. The reversal of 55320213 is 31202355.

55320213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55320213 - 2¹ = 55320211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55320213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55320211) 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 15 ways as a sum of consecutive naturals, for example, 21670 + ... + 24087.

It is an arithmetic number, because the mean of its divisors is an integer number (5124896).

Almost surely, 2^55320213 is an apocalyptic number.

It is an amenable number.

55320213 is a deficient number, since it is larger than the sum of its proper divisors (26678123).

55320213 is a wasteful number, since it uses less digits than its factorization.

55320213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45804.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 55320213 is about 7437.7559115636. The cubic root of 55320213 is about 381.0318516231.

Adding to 55320213 its reverse (31202355), we get a palindrome (86522568).

The spelling of 55320213 in words is "fifty-five million, three hundred twenty thousand, two hundred thirteen".