222421 has 4 divisors (see below), whose sum is σ = 224812. Its totient is φ = 220032.

The previous prime is 222419. The next prime is 222437. The reversal of 222421 is 124222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81796 + 140625 = 286^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 222421 - 2¹ = 222419 is a prime.

It is a super-2 number, since 2×222421² = 98942202482, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222461) 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, 1050 + ... + 1243.

It is an arithmetic number, because the mean of its divisors is an integer number (56203).

2²²²⁴²¹ is an apocalyptic number.

It is an amenable number.

222421 is a deficient number, since it is larger than the sum of its proper divisors (2391).

222421 is an equidigital number, since it uses as much as digits as its factorization.

222421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390.

The product of its digits is 64, while the sum is 13.

The square root of 222421 is about 471.6153093359. The cubic root of 222421 is about 60.5887412051.

Adding to 222421 its reverse (124222), we get a palindrome (346643).

The spelling of 222421 in words is "two hundred twenty-two thousand, four hundred twenty-one", and thus it is an iban number.