221552005 has 4 divisors (see below), whose sum is σ = 265862412. Its totient is φ = 177241600.

The previous prime is 221551991. The next prime is 221552063. The reversal of 221552005 is 500255122.

221552005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 44076321 + 177475684 = 6639^2 + 13322^2 .

It is not a de Polignac number, because 221552005 - 2⁷ = 221551877 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22155196 + ... + 22155205.

It is an arithmetic number, because the mean of its divisors is an integer number (66465603).

Almost surely, 2^221552005 is an apocalyptic number.

It is an amenable number.

221552005 is a deficient number, since it is larger than the sum of its proper divisors (44310407).

221552005 is an equidigital number, since it uses as much as digits as its factorization.

221552005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44310406.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 221552005 is about 14884.6231057424. The cubic root of 221552005 is about 605.0973183157.

The spelling of 221552005 in words is "two hundred twenty-one million, five hundred fifty-two thousand, five".