201221100212 has 24 divisors (see below), whose sum is σ = 397395905760. Its totient is φ = 88310200160.

The previous prime is 201221100211. The next prime is 201221100239. The reversal of 201221100212 is 212001122102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221100211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78847118 + ... + 78849669.

It is an arithmetic number, because the mean of its divisors is an integer number (16558162740).

Almost surely, 2^201221100212 is an apocalyptic number.

201221100212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

201221100212 is a deficient number, since it is larger than the sum of its proper divisors (196174805548).

201221100212 is a wasteful number, since it uses less digits than its factorization.

201221100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157696831 (or 157696829 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201221100212 its reverse (212001122102), we get a palindrome (413222222314).

The spelling of 201221100212 in words is "two hundred one billion, two hundred twenty-one million, one hundred thousand, two hundred twelve".