53503321 has 4 divisors (see below), whose sum is σ = 53539200. Its totient is φ = 53467444.

The previous prime is 53503217. The next prime is 53503327. The reversal of 53503321 is 12330535.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 53503321 - 2¹⁵ = 53470553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53503292 and 53503301.

It is not an unprimeable number, because it can be changed into a prime (53503327) 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, 15601 + ... + 18718.

It is an arithmetic number, because the mean of its divisors is an integer number (13384800).

Almost surely, 2^53503321 is an apocalyptic number.

It is an amenable number.

53503321 is a deficient number, since it is larger than the sum of its proper divisors (35879).

53503321 is a wasteful number, since it uses less digits than its factorization.

53503321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35878.

The product of its (nonzero) digits is 1350, while the sum is 22.

The square root of 53503321 is about 7314.5964345273. The cubic root of 53503321 is about 376.8138987252.

Adding to 53503321 its reverse (12330535), we get a palindrome (65833856).

It can be divided in two parts, 53503 and 321, that added together give a square (53824 = 232²).

The spelling of 53503321 in words is "fifty-three million, five hundred three thousand, three hundred twenty-one".