21201020101212 has 192 divisors, whose sum is σ = 58538652856320. Its totient is φ = 5845728559104.

The previous prime is 21201020101207. The next prime is 21201020101259. The reversal of 21201020101212 is 21210102010212.

It is a junction number, because it is equal to n+sod(n) for n = 21201020101191 and 21201020101200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 202094989 + ... + 202199867.

It is an arithmetic number, because the mean of its divisors is an integer number (304888816960).

Almost surely, 2^{21201020101212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21201020101212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29269326428160).

21201020101212 is an abundant number, since it is smaller than the sum of its proper divisors (37337632755108).

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

21201020101212 is a wasteful number, since it uses less digits than its factorization.

21201020101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105460 (or 105458 counting only the distinct ones).

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

Adding to 21201020101212 its reverse (21210102010212), we get a palindrome (42411122111424).

The spelling of 21201020101212 in words is "twenty-one trillion, two hundred one billion, twenty million, one hundred one thousand, two hundred twelve".