55530321 has 32 divisors (see below), whose sum is σ = 92691456. Its totient is φ = 28728000.

The previous prime is 55530317. The next prime is 55530323. The reversal of 55530321 is 12303555.

It is not a de Polignac number, because 55530321 - 2² = 55530317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55530291 and 55530300.

It is not an unprimeable number, because it can be changed into a prime (55530323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96966 + ... + 97536.

It is an arithmetic number, because the mean of its divisors is an integer number (2896608).

Almost surely, 2^55530321 is an apocalyptic number.

It is an amenable number.

55530321 is a deficient number, since it is larger than the sum of its proper divisors (37161135).

55530321 is a wasteful number, since it uses less digits than its factorization.

55530321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013.

The product of its (nonzero) digits is 2250, while the sum is 24.

The square root of 55530321 is about 7451.8669472824. The cubic root of 55530321 is about 381.5136327247.

Adding to 55530321 its reverse (12303555), we get a palindrome (67833876).

It can be divided in two parts, 555 and 30321, that added together give a triangular number (30876 = T₂₄₈).

The spelling of 55530321 in words is "fifty-five million, five hundred thirty thousand, three hundred twenty-one".