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222221 = 359619

222221 has 4 divisors (see below), whose sum is σ = 223200. Its totient is φ = 221244.

The previous prime is 222199. The next prime is 222247. The reversal of 222221 is 122222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 222221 - 210 = 221197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 222221.

It is not an unprimeable number, because it can be changed into a prime (224221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50 + ... + 668.

It is an arithmetic number, because the mean of its divisors is an integer number (55800).

2222221 is an apocalyptic number.

It is an amenable number.

222221 is a deficient number, since it is larger than the sum of its proper divisors (979).

222221 is an equidigital number, since it uses as much as digits as its factorization.

222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978.

The product of its digits is 32, while the sum is 11.

The square root of 222221 is about 471.4032244268. The cubic root of 222221 is about 60.5705753813.

Adding to 222221 its reverse (122222), we get a palindrome (344443).

Subtracting from 222221 its reverse (122222), we obtain a palindrome (99999).

The spelling of 222221 in words is "two hundred twenty-two thousand, two hundred twenty-one", and thus it is an iban number.

Divisors: 1 359 619 222221