222213421 has 4 divisors (see below), whose sum is σ = 222523200. Its totient is φ = 221903644.

The previous prime is 222213413. The next prime is 222213437. The reversal of 222213421 is 124312222.

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 an emirpimes, since its reverse is a distinct semiprime: 124312222 = 2 ⋅62156111.

It is a cyclic number.

It is not a de Polignac number, because 222213421 - 2³ = 222213413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222213401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153811 + ... + 155248.

It is an arithmetic number, because the mean of its divisors is an integer number (55630800).

Almost surely, 2^222213421 is an apocalyptic number.

It is an amenable number.

222213421 is a deficient number, since it is larger than the sum of its proper divisors (309779).

222213421 is an equidigital number, since it uses as much as digits as its factorization.

222213421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309778.

The product of its digits is 384, while the sum is 19.

The square root of 222213421 is about 14906.8246451080. The cubic root of 222213421 is about 605.6988677307.

Adding to 222213421 its reverse (124312222), we get a palindrome (346525643).

The spelling of 222213421 in words is "two hundred twenty-two million, two hundred thirteen thousand, four hundred twenty-one".