55524221 has 4 divisors (see below), whose sum is σ = 55539744. Its totient is φ = 55508700.

The previous prime is 55524211. The next prime is 55524233. The reversal of 55524221 is 12242555.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55524221 is a prime.

It is a super-3 number, since 3×55524221³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55524211) 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, 626 + ... + 10556.

It is an arithmetic number, because the mean of its divisors is an integer number (13884936).

Almost surely, 2^55524221 is an apocalyptic number.

It is an amenable number.

55524221 is a deficient number, since it is larger than the sum of its proper divisors (15523).

55524221 is an equidigital number, since it uses as much as digits as its factorization.

55524221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15522.

The product of its digits is 4000, while the sum is 26.

The square root of 55524221 is about 7451.4576426361. The cubic root of 55524221 is about 381.4996624688.

Adding to 55524221 its reverse (12242555), we get a palindrome (67766776).

The spelling of 55524221 in words is "fifty-five million, five hundred twenty-four thousand, two hundred twenty-one".