222211021 has 8 divisors (see below), whose sum is σ = 235481400. Its totient is φ = 209314560.

The previous prime is 222211019. The next prime is 222211037. The reversal of 222211021 is 120112222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4972900 + 217238121 = 2230^2 + 14739^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 222211021 - 2¹ = 222211019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222210992 and 222211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222211081) 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, 92256 + ... + 94633.

It is an arithmetic number, because the mean of its divisors is an integer number (29435175).

Almost surely, 2^222211021 is an apocalyptic number.

It is an amenable number.

222211021 is a deficient number, since it is larger than the sum of its proper divisors (13270379).

222211021 is a wasteful number, since it uses less digits than its factorization.

222211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186959.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 222211021 is about 14906.7441448493. The cubic root of 222211021 is about 605.6966871206.

Adding to 222211021 its reverse (120112222), we get a palindrome (342323243).

The spelling of 222211021 in words is "two hundred twenty-two million, two hundred eleven thousand, twenty-one".