222111421 has 4 divisors (see below), whose sum is σ = 253841632. Its totient is φ = 190381212.

The previous prime is 222111401. The next prime is 222111517. The reversal of 222111421 is 124111222.

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: 124111222 = 2 ⋅62055611.

It is not a de Polignac number, because 222111421 - 2⁷ = 222111293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222111395 and 222111404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222111401) 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, 15865095 + ... + 15865108.

It is an arithmetic number, because the mean of its divisors is an integer number (63460408).

Almost surely, 2^222111421 is an apocalyptic number.

It is an amenable number.

222111421 is a deficient number, since it is larger than the sum of its proper divisors (31730211).

222111421 is an equidigital number, since it uses as much as digits as its factorization.

222111421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31730210.

The product of its digits is 64, while the sum is 16.

The square root of 222111421 is about 14903.4030006573. The cubic root of 222111421 is about 605.6061779500.

Adding to 222111421 its reverse (124111222), we get a palindrome (346222643).

It can be divided in two parts, 22211 and 1421, that added together give a palindrome (23632).

The spelling of 222111421 in words is "two hundred twenty-two million, one hundred eleven thousand, four hundred twenty-one".