21222220020210 has 384 divisors, whose sum is σ = 64896089296896. Its totient is φ = 4759961310720.

The previous prime is 21222220020173. The next prime is 21222220020223. The reversal of 21222220020210 is 1202002222212.

21222220020210 is a `hidden beast` number, since 2 + 12 + 222 + 200 + 20 + 210 = 666.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 100743112 + ... + 100953548.

It is an arithmetic number, because the mean of its divisors is an integer number (169000232544).

Almost surely, 2^{21222220020210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222220020210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32448044648448).

21222220020210 is an abundant number, since it is smaller than the sum of its proper divisors (43673869276686).

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

21222220020210 is a wasteful number, since it uses less digits than its factorization.

21222220020210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210630 (or 210627 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21222220020210 its reverse (1202002222212), we get a palindrome (22424222242422).

The spelling of 21222220020210 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty million, twenty thousand, two hundred ten".