5545400221 has 4 divisors (see below), whose sum is σ = 5871600252. Its totient is φ = 5219200192.

The previous prime is 5545400209. The next prime is 5545400227. The reversal of 5545400221 is 1220045455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2103231321 + 3442168900 = 45861^2 + 58670^2 .

It is not a de Polignac number, because 5545400221 - 2¹³ = 5545392029 is a prime.

It is a super-2 number, since 2×5545400221² = 61502927222133697682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5545400221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5545400227) 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, 163099990 + ... + 163100023.

It is an arithmetic number, because the mean of its divisors is an integer number (1467900063).

Almost surely, 2^5545400221 is an apocalyptic number.

It is an amenable number.

5545400221 is a deficient number, since it is larger than the sum of its proper divisors (326200031).

5545400221 is a wasteful number, since it uses less digits than its factorization.

5545400221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326200030.

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 5545400221 is about 74467.4440342892. Note that the first 3 decimals coincide. The cubic root of 5545400221 is about 1770.0177917498.

Adding to 5545400221 its reverse (1220045455), we get a palindrome (6765445676).

The spelling of 5545400221 in words is "five billion, five hundred forty-five million, four hundred thousand, two hundred twenty-one".