221220102212 has 6 divisors (see below), whose sum is σ = 387135178878. Its totient is φ = 110610051104.

The previous prime is 221220102167. The next prime is 221220102217. The reversal of 221220102212 is 212201022122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 153715748356 + 67504353856 = 392066^2 + 259816^2 .

It is not an unprimeable number, because it can be changed into a prime (221220102217) 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 as a sum of consecutive naturals, namely, 27652512773 + ... + 27652512780.

It is an arithmetic number, because the mean of its divisors is an integer number (64522529813).

Almost surely, 2^221220102212 is an apocalyptic number.

It is an amenable number.

221220102212 is a deficient number, since it is larger than the sum of its proper divisors (165915076666).

221220102212 is a wasteful number, since it uses less digits than its factorization.

221220102212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55305025557 (or 55305025555 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221220102212 its reverse (212201022122), we get a palindrome (433421124334).

It can be divided in two parts, 2 and 21220102212, that multiplied together give a palindrome (42440204424).

The spelling of 221220102212 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred two thousand, two hundred twelve".