221210101212 has 12 divisors (see below), whose sum is σ = 516156902856. Its totient is φ = 73736700400.

The previous prime is 221210101199. The next prime is 221210101213. The reversal of 221210101212 is 212101012122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 221210101191 and 221210101200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210101213) 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 in 3 ways as a sum of consecutive naturals, for example, 9217087539 + ... + 9217087562.

It is an arithmetic number, because the mean of its divisors is an integer number (43013075238).

Almost surely, 2^221210101212 is an apocalyptic number.

It is an amenable number.

221210101212 is an abundant number, since it is smaller than the sum of its proper divisors (294946801644).

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

221210101212 is a wasteful number, since it uses less digits than its factorization.

221210101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18434175108 (or 18434175106 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221210101212 its reverse (212101012122), we get a palindrome (433311113334).

It can be divided in two parts, 2 and 21210101212, that multiplied together give a palindrome (42420202424).

The spelling of 221210101212 in words is "two hundred twenty-one billion, two hundred ten million, one hundred one thousand, two hundred twelve".