222222111001221 has 8 divisors (see below), whose sum is σ = 304304152001824. Its totient is φ = 144144072000720.

The previous prime is 222222111001159. The next prime is 222222111001349. The reversal of 222222111001221 is 122100111222222.

222222111001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 222222111001221 - 2⁹ = 222222111000709 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 (222222111001721) 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, 1001000499895 + ... + 1001000500116.

It is an arithmetic number, because the mean of its divisors is an integer number (38038019000228).

Almost surely, 2^{222222111001221} is an apocalyptic number.

It is an amenable number.

222222111001221 is a deficient number, since it is larger than the sum of its proper divisors (82082041000603).

222222111001221 is a wasteful number, since it uses less digits than its factorization.

222222111001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002001000051.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 222222111001221 its reverse (122100111222222), we get a palindrome (344322222223443).

The spelling of 222222111001221 in words is "two hundred twenty-two trillion, two hundred twenty-two billion, one hundred eleven million, one thousand, two hundred twenty-one".