221022212212 has 6 divisors (see below), whose sum is σ = 386788871378. Its totient is φ = 110511106104.

The previous prime is 221022212167. The next prime is 221022212219. The reversal of 221022212212 is 212212220122.

It can be written as a sum of positive squares in only one way, i.e., 219554096356 + 1468115856 = 468566^2 + 38316^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221022212212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022212219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27627776523 + ... + 27627776530.

Almost surely, 2^221022212212 is an apocalyptic number.

It is an amenable number.

221022212212 is a deficient number, since it is larger than the sum of its proper divisors (165766659166).

221022212212 is a wasteful number, since it uses less digits than its factorization.

221022212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55255553057 (or 55255553055 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221022212212 its reverse (212212220122), we get a palindrome (433234432334).

The spelling of 221022212212 in words is "two hundred twenty-one billion, twenty-two million, two hundred twelve thousand, two hundred twelve".