222222211121221 has 32 divisors (see below), whose sum is σ = 235376503689600. Its totient is φ = 209490077287680.

The previous prime is 222222211121179. The next prime is 222222211121231. The reversal of 222222211121221 is 122121112222222.

It is a cyclic number.

It is not a de Polignac number, because 222222211121221 - 2²⁵ = 222222177566789 is a prime.

It is a super-2 number, since 2×222222211121221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222222211121231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177651255 + ... + 178897771.

It is an arithmetic number, because the mean of its divisors is an integer number (7355515740300).

Almost surely, 2^{222222211121221} is an apocalyptic number.

It is an amenable number.

222222211121221 is a deficient number, since it is larger than the sum of its proper divisors (13154292568379).

222222211121221 is a wasteful number, since it uses less digits than its factorization.

222222211121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247349.

The product of its digits is 1024, while the sum is 25.

Adding to 222222211121221 its reverse (122121112222222), we get a palindrome (344343323343443).

The spelling of 222222211121221 in words is "two hundred twenty-two trillion, two hundred twenty-two billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".