53323221 has 12 divisors (see below), whose sum is σ = 82705632. Its totient is φ = 30470328.

The previous prime is 53323187. The next prime is 53323243. The reversal of 53323221 is 12232335.

It is not a de Polignac number, because 53323221 - 2⁷ = 53323093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53323261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181225 + ... + 181518.

It is an arithmetic number, because the mean of its divisors is an integer number (6892136).

Almost surely, 2^53323221 is an apocalyptic number.

It is an amenable number.

53323221 is a deficient number, since it is larger than the sum of its proper divisors (29382411).

53323221 is a wasteful number, since it uses less digits than its factorization.

53323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362760 (or 362753 counting only the distinct ones).

The product of its digits is 1080, while the sum is 21.

The square root of 53323221 is about 7302.2750564464. The cubic root of 53323221 is about 376.3906198737.

Adding to 53323221 its reverse (12232335), we get a palindrome (65555556).

The spelling of 53323221 in words is "fifty-three million, three hundred twenty-three thousand, two hundred twenty-one".