2188221 has 16 divisors (see below), whose sum is σ = 3379200. Its totient is φ = 1233648.

The previous prime is 2188213. The next prime is 2188231. The reversal of 2188221 is 1228812.

It is not a de Polignac number, because 2188221 - 2³ = 2188213 is a prime.

It is a super-2 number, since 2×2188221² = 9576622289682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2188191 and 2188200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1000 + ... + 2318.

It is an arithmetic number, because the mean of its divisors is an integer number (211200).

2^2188221 is an apocalyptic number.

2188221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2188221 is a deficient number, since it is larger than the sum of its proper divisors (1190979).

2188221 is a wasteful number, since it uses less digits than its factorization.

2188221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408.

The product of its digits is 512, while the sum is 24.

The square root of 2188221 is about 1479.2636681809. The cubic root of 2188221 is about 129.8266130301.

The spelling of 2188221 in words is "two million, one hundred eighty-eight thousand, two hundred twenty-one".