221022221222212 has 6 divisors (see below), whose sum is σ = 386788887138878. Its totient is φ = 110511110611104.

The previous prime is 221022221222203. The next prime is 221022221222237. The reversal of 221022221222212 is 212222122220122.

It can be written as a sum of positive squares in only one way, i.e., 153412649192196 + 67609572030016 = 12385986^2 + 8222504^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27627777652773 + ... + 27627777652780.

Almost surely, 2^{221022221222212} is an apocalyptic number.

It is an amenable number.

221022221222212 is a deficient number, since it is larger than the sum of its proper divisors (165766665916666).

221022221222212 is a wasteful number, since it uses less digits than its factorization.

221022221222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55255555305557 (or 55255555305555 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 221022221222212 its reverse (212222122220122), we get a palindrome (433244343442334).

The spelling of 221022221222212 in words is "two hundred twenty-one trillion, twenty-two billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twelve".