222221021221 has 8 divisors (see below), whose sum is σ = 230125576824. Its totient is φ = 214453936320.

The previous prime is 222221021219. The next prime is 222221021227. The reversal of 222221021221 is 122120122222.

It can be written as a sum of positive squares in 4 ways, for example, as 12850716321 + 209370304900 = 113361^2 + 457570^2 .

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 222221021221 - 2¹ = 222221021219 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 (222221021227) 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, 34364386 + ... + 34370851.

It is an arithmetic number, because the mean of its divisors is an integer number (28765697103).

Almost surely, 2^222221021221 is an apocalyptic number.

It is an amenable number.

222221021221 is a deficient number, since it is larger than the sum of its proper divisors (7904555603).

222221021221 is an equidigital number, since it uses as much as digits as its factorization.

222221021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68735351.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 222221021221 its reverse (122120122222), we get a palindrome (344341143443).

The spelling of 222221021221 in words is "two hundred twenty-two billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty-one".