21202210220212 has 96 divisors (see below), whose sum is σ = 43662752888832. Its totient is φ = 8819700253056.

The previous prime is 21202210220207. The next prime is 21202210220327. The reversal of 21202210220212 is 21202201220212.

It is a self number, because there is not a number n which added to its sum of digits gives 21202210220212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 822958443 + ... + 822984205.

It is an arithmetic number, because the mean of its divisors is an integer number (454820342592).

Almost surely, 2^{21202210220212} 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 21202210220212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21831376444416).

21202210220212 is an abundant number, since it is smaller than the sum of its proper divisors (22460542668620).

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

21202210220212 is a wasteful number, since it uses less digits than its factorization.

21202210220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30077 (or 30075 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21202210220212 its reverse (21202201220212), we get a palindrome (42404411440424).

Subtracting from 21202210220212 its reverse (21202201220212), we obtain a square (9000000 = 3000²).

The spelling of 21202210220212 in words is "twenty-one trillion, two hundred two billion, two hundred ten million, two hundred twenty thousand, two hundred twelve".