221205552 has 80 divisors (see below), whose sum is σ = 582438912. Its totient is φ = 72334080.

The previous prime is 221205529. The next prime is 221205557. The reversal of 221205552 is 255502122.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (221205557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 798438 + ... + 798714.

Almost surely, 2^221205552 is an apocalyptic number.

It is an amenable number.

221205552 is an abundant number, since it is smaller than the sum of its proper divisors (361233360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221205552 is a wasteful number, since it uses less digits than its factorization.

221205552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 221205552 is about 14872.9806024213. The cubic root of 221205552 is about 604.7817458307.

Adding to 221205552 its reverse (255502122), we get a palindrome (476707674).

It can be divided in two parts, 22120 and 5552, that added together give a palindrome (27672).

The spelling of 221205552 in words is "two hundred twenty-one million, two hundred five thousand, five hundred fifty-two".