221021100212212 has 6 divisors (see below), whose sum is σ = 386786925371378. Its totient is φ = 110510550106104.

The previous prime is 221021100212191. The next prime is 221021100212219. The reversal of 221021100212212 is 212212001120122.

It can be written as a sum of positive squares in only one way, i.e., 186256821988836 + 34764278223376 = 13647594^2 + 5896124^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221021100212212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021100212219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27627637526523 + ... + 27627637526530.

Almost surely, 2^{221021100212212} is an apocalyptic number.

It is an amenable number.

221021100212212 is a deficient number, since it is larger than the sum of its proper divisors (165765825159166).

221021100212212 is a wasteful number, since it uses less digits than its factorization.

221021100212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55255275053057 (or 55255275053055 counting only the distinct ones).

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

Adding to 221021100212212 its reverse (212212001120122), we get a palindrome (433233101332334).

The spelling of 221021100212212 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred million, two hundred twelve thousand, two hundred twelve".