221121112200212 has 18 divisors (see below), whose sum is σ = 450139406979402. Its totient is φ = 94766190942864.

The previous prime is 221121112200199. The next prime is 221121112200257. The reversal of 221121112200212 is 212002211121122.

It can be written as a sum of positive squares in only one way, i.e., 209764994026756 + 11356118173456 = 14483266^2 + 3369884^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 564084469703 + ... + 564084470094.

It is an arithmetic number, because the mean of its divisors is an integer number (25007744832189).

Almost surely, 2^{221121112200212} is an apocalyptic number.

It is an amenable number.

221121112200212 is an abundant number, since it is smaller than the sum of its proper divisors (229018294779190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221121112200212 is a wasteful number, since it uses less digits than its factorization.

221121112200212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128168939815 (or 1128168939806 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221121112200212 its reverse (212002211121122), we get a palindrome (433123323321334).

The spelling of 221121112200212 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred twelve million, two hundred thousand, two hundred twelve".