221162221 has 8 divisors (see below), whose sum is σ = 253021824. Its totient is φ = 189368880.

The previous prime is 221162189. The next prime is 221162233. The reversal of 221162221 is 122261122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221162221 - 2⁵ = 221162189 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 (221162281) 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 7 ways as a sum of consecutive naturals, for example, 9190 + ... + 22951.

It is an arithmetic number, because the mean of its divisors is an integer number (31627728).

Almost surely, 2^221162221 is an apocalyptic number.

It is an amenable number.

221162221 is a deficient number, since it is larger than the sum of its proper divisors (31859603).

221162221 is an equidigital number, since it uses as much as digits as its factorization.

221162221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33131.

The product of its digits is 192, while the sum is 19.

The square root of 221162221 is about 14871.5238291172. The cubic root of 221162221 is about 604.7422538908.

The spelling of 221162221 in words is "two hundred twenty-one million, one hundred sixty-two thousand, two hundred twenty-one".