221454055 has 4 divisors (see below), whose sum is σ = 265744872. Its totient is φ = 177163240.

The previous prime is 221454031. The next prime is 221454109. The reversal of 221454055 is 550454122.

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

It is not a de Polignac number, because 221454055 - 2⁷ = 221453927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22145401 + ... + 22145410.

It is an arithmetic number, because the mean of its divisors is an integer number (66436218).

Almost surely, 2^221454055 is an apocalyptic number.

221454055 is a deficient number, since it is larger than the sum of its proper divisors (44290817).

221454055 is an equidigital number, since it uses as much as digits as its factorization.

221454055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44290816.

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

The square root of 221454055 is about 14881.3324336230. The cubic root of 221454055 is about 605.0081323042.

It can be divided in two parts, 221 and 454055, that added together give a square (454276 = 674²).

The spelling of 221454055 in words is "two hundred twenty-one million, four hundred fifty-four thousand, fifty-five".