1018221 has 8 divisors (see below), whose sum is σ = 1365504. Its totient is φ = 674880.

The previous prime is 1018217. The next prime is 1018223. The reversal of 1018221 is 1228101.

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

It is not a de Polignac number, because 1018221 - 2² = 1018217 is a prime.

1018221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1018221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1018223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316 + ... + 1461.

It is an arithmetic number, because the mean of its divisors is an integer number (170688).

2^1018221 is an apocalyptic number.

It is an amenable number.

1018221 is a deficient number, since it is larger than the sum of its proper divisors (347283).

1018221 is a wasteful number, since it uses less digits than its factorization.

1018221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1018221 is about 1009.0693732346. The cubic root of 1018221 is about 100.6037146187.

The spelling of 1018221 in words is "one million, eighteen thousand, two hundred twenty-one".