21200021201212 has 192 divisors, whose sum is σ = 44439674388480. Its totient is φ = 8658752256000.

The previous prime is 21200021201159. The next prime is 21200021201231. The reversal of 21200021201212 is 21210212000212.

It is a happy number.

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, 16601425518 + ... + 16601426794.

It is an arithmetic number, because the mean of its divisors is an integer number (231456637440).

Almost surely, 2^{21200021201212} 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 21200021201212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22219837194240).

21200021201212 is an abundant number, since it is smaller than the sum of its proper divisors (23239653187268).

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

21200021201212 is a wasteful number, since it uses less digits than its factorization.

21200021201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292 (or 2290 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21200021201212 its reverse (21210212000212), we get a palindrome (42410233201424).

The spelling of 21200021201212 in words is "twenty-one trillion, two hundred billion, twenty-one million, two hundred one thousand, two hundred twelve".