21201202212 has 72 divisors (see below), whose sum is σ = 53066728512. Its totient is φ = 6585278400.

The previous prime is 21201202207. The next prime is 21201202241. The reversal of 21201202212 is 21220210212.

It is a super-2 number, since 2×21201202212² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21201202191 and 21201202200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 224137 + ... + 304367.

It is an arithmetic number, because the mean of its divisors is an integer number (737037896).

Almost surely, 2^21201202212 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 21201202212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26533364256).

21201202212 is an abundant number, since it is smaller than the sum of its proper divisors (31865526300).

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

21201202212 is a wasteful number, since it uses less digits than its factorization.

21201202212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80337 (or 80316 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21201202212 its reverse (21220210212), we get a palindrome (42421412424).

The spelling of 21201202212 in words is "twenty-one billion, two hundred one million, two hundred two thousand, two hundred twelve".