55205221 has 8 divisors (see below), whose sum is σ = 59163264. Its totient is φ = 51377040.

The previous prime is 55205207. The next prime is 55205243. The reversal of 55205221 is 12250255.

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 55205221 - 2¹⁹ = 54680933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55205192 and 55205201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55205201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31585 + ... + 33286.

It is an arithmetic number, because the mean of its divisors is an integer number (7395408).

Almost surely, 2^55205221 is an apocalyptic number.

It is an amenable number.

55205221 is a deficient number, since it is larger than the sum of its proper divisors (3958043).

55205221 is a wasteful number, since it uses less digits than its factorization.

55205221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64931.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 55205221 is about 7430.0216015837. The cubic root of 55205221 is about 380.7676563938.

Adding to 55205221 its reverse (12250255), we get a palindrome (67455476).

The spelling of 55205221 in words is "fifty-five million, two hundred five thousand, two hundred twenty-one".