222211121221 has 8 divisors (see below), whose sum is σ = 223509789440. Its totient is φ = 220915151712.

The previous prime is 222211121207. The next prime is 222211121261. The reversal of 222211121221 is 122121112222.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222211121221 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 (222211121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509400 + ... + 838993.

It is an arithmetic number, because the mean of its divisors is an integer number (27938723680).

Almost surely, 2^222211121221 is an apocalyptic number.

It is an amenable number.

222211121221 is a deficient number, since it is larger than the sum of its proper divisors (1298668219).

222211121221 is a wasteful number, since it uses less digits than its factorization.

222211121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349355.

The product of its digits is 128, while the sum is 19.

Adding to 222211121221 its reverse (122121112222), we get a palindrome (344332233443).

The spelling of 222211121221 in words is "two hundred twenty-two billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".