4555400221 has 4 divisors (see below), whose sum is σ = 4565368732. Its totient is φ = 4545431712.

The previous prime is 4555400209. The next prime is 4555400237. The reversal of 4555400221 is 1220045554.

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 3081915225 + 1473484996 = 55515^2 + 38386^2 .

It is a cyclic number.

It is not a de Polignac number, because 4555400221 - 2¹¹ = 4555398173 is a prime.

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 4555400221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4555400251) 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, 4983570 + ... + 4984483.

It is an arithmetic number, because the mean of its divisors is an integer number (1141342183).

Almost surely, 2^4555400221 is an apocalyptic number.

It is an amenable number.

4555400221 is a deficient number, since it is larger than the sum of its proper divisors (9968511).

4555400221 is an equidigital number, since it uses as much as digits as its factorization.

4555400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9968510.

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

The square root of 4555400221 is about 67493.7050472116. The cubic root of 4555400221 is about 1657.7111025445.

Adding to 4555400221 its reverse (1220045554), we get a palindrome (5775445775).

The spelling of 4555400221 in words is "four billion, five hundred fifty-five million, four hundred thousand, two hundred twenty-one".