55521 has 12 divisors (see below), whose sum is σ = 83200. Its totient is φ = 35640.

The previous prime is 55511. The next prime is 55529. The reversal of 55521 is 12555.

55521 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55521 - 2⁶ = 55457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 55494 and 55503.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 55521.

It is not an unprimeable number, because it can be changed into a prime (55529) 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, 180 + ... + 378.

2⁵⁵⁵²¹ is an apocalyptic number.

It is an amenable number.

55521 is a deficient number, since it is larger than the sum of its proper divisors (27679).

55521 is a wasteful number, since it uses less digits than its factorization.

55521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 233 counting only the distinct ones).

The product of its digits is 250, while the sum is 18.

The square root of 55521 is about 235.6289455903. The cubic root of 55521 is about 38.1492285303.

It can be divided in two parts, 555 and 21, that added together give a square (576 = 24²).

The spelling of 55521 in words is "fifty-five thousand, five hundred twenty-one".