221053555 has 4 divisors (see below), whose sum is σ = 265264272. Its totient is φ = 176842840.

The previous prime is 221053541. The next prime is 221053559. The reversal of 221053555 is 555350122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 555350122 = 2 ⋅277675061.

It is not a de Polignac number, because 221053555 - 2⁵ = 221053523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221053559) 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 3 ways as a sum of consecutive naturals, for example, 22105351 + ... + 22105360.

It is an arithmetic number, because the mean of its divisors is an integer number (66316068).

Almost surely, 2^221053555 is an apocalyptic number.

221053555 is a deficient number, since it is larger than the sum of its proper divisors (44210717).

221053555 is an equidigital number, since it uses as much as digits as its factorization.

221053555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44210716.

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 221053555 is about 14867.8698877815. The cubic root of 221053555 is about 604.6431928378.

The spelling of 221053555 in words is "two hundred twenty-one million, fifty-three thousand, five hundred fifty-five".