7018221 has 12 divisors (see below), whose sum is σ = 10885632. Its totient is φ = 4010328.

The previous prime is 7018213. The next prime is 7018259. The reversal of 7018221 is 1228107.

It is not a de Polignac number, because 7018221 - 2³ = 7018213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7018021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23725 + ... + 24018.

It is an arithmetic number, because the mean of its divisors is an integer number (907136).

Almost surely, 2^7018221 is an apocalyptic number.

It is an amenable number.

7018221 is a deficient number, since it is larger than the sum of its proper divisors (3867411).

7018221 is a wasteful number, since it uses less digits than its factorization.

7018221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47760 (or 47753 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 7018221 is about 2649.1925184856. The cubic root of 7018221 is about 191.4589531333.

The spelling of 7018221 in words is "seven million, eighteen thousand, two hundred twenty-one".