55227221 has 4 divisors (see below), whose sum is σ = 63116832. Its totient is φ = 47337612.

The previous prime is 55227217. The next prime is 55227233. The reversal of 55227221 is 12272255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 55227221 - 2² = 55227217 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 (55227521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3944795 + ... + 3944808.

It is an arithmetic number, because the mean of its divisors is an integer number (15779208).

Almost surely, 2^55227221 is an apocalyptic number.

It is an amenable number.

55227221 is a deficient number, since it is larger than the sum of its proper divisors (7889611).

55227221 is an equidigital number, since it uses as much as digits as its factorization.

55227221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7889610.

The product of its digits is 2800, while the sum is 26.

The square root of 55227221 is about 7431.5019343333. The cubic root of 55227221 is about 380.8182299674.

Adding to 55227221 its reverse (12272255), we get a palindrome (67499476).

The spelling of 55227221 in words is "fifty-five million, two hundred twenty-seven thousand, two hundred twenty-one".