55023521 has 12 divisors (see below), whose sum is σ = 66791232. Its totient is φ = 45111528.

The previous prime is 55023503. The next prime is 55023523. The reversal of 55023521 is 12532055.

It is a de Polignac number, because none of the positive numbers 2^k-55023521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55023523) 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, 23285 + ... + 25538.

It is an arithmetic number, because the mean of its divisors is an integer number (5565936).

Almost surely, 2^55023521 is an apocalyptic number.

It is an amenable number.

55023521 is a deficient number, since it is larger than the sum of its proper divisors (11767711).

55023521 is a wasteful number, since it uses less digits than its factorization.

55023521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48860 (or 48853 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 55023521 is about 7417.7841030863. The cubic root of 55023521 is about 380.3494500136.

Adding to 55023521 its reverse (12532055), we get a palindrome (67555576).

The spelling of 55023521 in words is "fifty-five million, twenty-three thousand, five hundred twenty-one".