201221201022012 has 36 divisors (see below), whose sum is σ = 508669803454176. Its totient is φ = 67070130628800.

The previous prime is 201221201021999. The next prime is 201221201022089. The reversal of 201221201022012 is 210220102122102.

It is a happy number.

201221201022012 is a `hidden beast` number, since 20 + 1 + 221 + 201 + 0 + 220 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149447364 + ... + 150787787.

It is an arithmetic number, because the mean of its divisors is an integer number (14129716762616).

Almost surely, 2^{201221201022012} is an apocalyptic number.

It is an amenable number.

201221201022012 is an abundant number, since it is smaller than the sum of its proper divisors (307448602432164).

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

201221201022012 is a wasteful number, since it uses less digits than its factorization.

201221201022012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300253778 (or 300253773 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 201221201022012 its reverse (210220102122102), we get a palindrome (411441303144114).

The spelling of 201221201022012 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred one million, twenty-two thousand, twelve".