222221011221221 has 4 divisors (see below), whose sum is σ = 222599581939392. Its totient is φ = 221842440503052.

The previous prime is 222221011221217. The next prime is 222221011221239. The reversal of 222221011221221 is 122122110122222.

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.

It is a cyclic number.

It is not a de Polignac number, because 222221011221221 - 2² = 222221011221217 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 (222221011229221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189285358205 + ... + 189285359378.

It is an arithmetic number, because the mean of its divisors is an integer number (55649895484848).

Almost surely, 2^{222221011221221} is an apocalyptic number.

It is an amenable number.

222221011221221 is a deficient number, since it is larger than the sum of its proper divisors (378570718171).

222221011221221 is an equidigital number, since it uses as much as digits as its factorization.

222221011221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378570718170.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 222221011221221 its reverse (122122110122222), we get a palindrome (344343121343443).

The spelling of 222221011221221 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, eleven million, two hundred twenty-one thousand, two hundred twenty-one".