53224221 has 4 divisors (see below), whose sum is σ = 70965632. Its totient is φ = 35482812.

The previous prime is 53224217. The next prime is 53224247. The reversal of 53224221 is 12242235.

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 53224221 - 2² = 53224217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53224201) 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, 8870701 + ... + 8870706.

It is an arithmetic number, because the mean of its divisors is an integer number (17741408).

Almost surely, 2^53224221 is an apocalyptic number.

It is an amenable number.

53224221 is a deficient number, since it is larger than the sum of its proper divisors (17741411).

53224221 is a wasteful number, since it uses less digits than its factorization.

53224221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17741410.

The product of its digits is 960, while the sum is 21.

The square root of 53224221 is about 7295.4931978585. The cubic root of 53224221 is about 376.1575397062.

Adding to 53224221 its reverse (12242235), we get a palindrome (65466456).

It can be divided in two parts, 532 and 24221, that added together give a triangular number (24753 = T₂₂₂).

The spelling of 53224221 in words is "fifty-three million, two hundred twenty-four thousand, two hundred twenty-one".