222111021 has 8 divisors (see below), whose sum is σ = 323070624. Its totient is φ = 134612720.

The previous prime is 222111017. The next prime is 222111031. The reversal of 222111021 is 120111222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 222111021 - 2² = 222111017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 222110988 and 222111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222111011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3365286 + ... + 3365351.

It is an arithmetic number, because the mean of its divisors is an integer number (40383828).

Almost surely, 2^222111021 is an apocalyptic number.

It is an amenable number.

222111021 is a deficient number, since it is larger than the sum of its proper divisors (100959603).

222111021 is a wasteful number, since it uses less digits than its factorization.

222111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6730651.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 222111021 is about 14903.3895808974. The cubic root of 222111021 is about 605.6058144048.

Adding to 222111021 its reverse (120111222), we get a palindrome (342222243).

It can be divided in two parts, 22211 and 1021, that added together give a palindrome (23232).

The spelling of 222111021 in words is "two hundred twenty-two million, one hundred eleven thousand, twenty-one".