221672055 has 16 divisors (see below), whose sum is σ = 386918784. Its totient is φ = 107477280.

The previous prime is 221672051. The next prime is 221672071. The reversal of 221672055 is 550276122.

It is not a de Polignac number, because 221672055 - 2² = 221672051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221672051) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 671569 + ... + 671898.

It is an arithmetic number, because the mean of its divisors is an integer number (24182424).

Almost surely, 2^221672055 is an apocalyptic number.

221672055 is a deficient number, since it is larger than the sum of its proper divisors (165246729).

221672055 is a wasteful number, since it uses less digits than its factorization.

221672055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343486.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 221672055 is about 14888.6552448500. The cubic root of 221672055 is about 605.2065911046.

It can be divided in two parts, 221 and 672055, that added together give a palindrome (672276).

The spelling of 221672055 in words is "two hundred twenty-one million, six hundred seventy-two thousand, fifty-five".