221011201212 has 12 divisors (see below), whose sum is σ = 515692802856. Its totient is φ = 73670400400.

The previous prime is 221011201199. The next prime is 221011201219. The reversal of 221011201212 is 212102110122.

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

It is a super-2 number, since 2×221011201212² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221011201191 and 221011201200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011201219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9208800039 + ... + 9208800062.

It is an arithmetic number, because the mean of its divisors is an integer number (42974400238).

Almost surely, 2^221011201212 is an apocalyptic number.

It is an amenable number.

221011201212 is an abundant number, since it is smaller than the sum of its proper divisors (294681601644).

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

221011201212 is a wasteful number, since it uses less digits than its factorization.

221011201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18417600108 (or 18417600106 counting only the distinct ones).

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

Adding to 221011201212 its reverse (212102110122), we get a palindrome (433113311334).

The spelling of 221011201212 in words is "two hundred twenty-one billion, eleven million, two hundred one thousand, two hundred twelve".