221254221 has 16 divisors (see below), whose sum is σ = 317757440. Its totient is φ = 136488240.

The previous prime is 221254199. The next prime is 221254249. The reversal of 221254221 is 122452122.

It is not a de Polignac number, because 221254221 - 2⁶ = 221254157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221254321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42685 + ... + 47586.

It is an arithmetic number, because the mean of its divisors is an integer number (19859840).

Almost surely, 2^221254221 is an apocalyptic number.

It is an amenable number.

221254221 is a deficient number, since it is larger than the sum of its proper divisors (96503219).

221254221 is a wasteful number, since it uses less digits than its factorization.

221254221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90336.

The product of its digits is 640, while the sum is 21.

The square root of 221254221 is about 14874.6166673296. The cubic root of 221254221 is about 604.8260966832.

The spelling of 221254221 in words is "two hundred twenty-one million, two hundred fifty-four thousand, two hundred twenty-one".