55532213221 has 8 divisors (see below), whose sum is σ = 55603552664. Its totient is φ = 55460920320.

The previous prime is 55532213189. The next prime is 55532213237. The reversal of 55532213221 is 12231223555.

It can be written as a sum of positive squares in 4 ways, for example, as 10689492100 + 44842721121 = 103390^2 + 211761^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 55532213221 - 2⁵ = 55532213189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55532213281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2792911 + ... + 2812723.

It is an arithmetic number, because the mean of its divisors is an integer number (6950444083).

Almost surely, 2^55532213221 is an apocalyptic number.

It is an amenable number.

55532213221 is a deficient number, since it is larger than the sum of its proper divisors (71339443).

55532213221 is a wasteful number, since it uses less digits than its factorization.

55532213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23271.

The product of its digits is 18000, while the sum is 31.

Adding to 55532213221 its reverse (12231223555), we get a palindrome (67763436776).

The spelling of 55532213221 in words is "fifty-five billion, five hundred thirty-two million, two hundred thirteen thousand, two hundred twenty-one".