21222120210210 has 64 divisors (see below), whose sum is σ = 58417879311360. Its totient is φ = 5476676181120.

The previous prime is 21222120210191. The next prime is 21222120210217. The reversal of 21222120210210 is 1201202122212.

It is a happy number.

21222120210210 is a `hidden beast` number, since 2 + 1 + 2 + 221 + 20 + 210 + 210 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21222120210217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1267740747 + ... + 1267757486.

It is an arithmetic number, because the mean of its divisors is an integer number (912779364240).

Almost surely, 2^{21222120210210} is an apocalyptic number.

21222120210210 is an abundant number, since it is smaller than the sum of its proper divisors (37195759101150).

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

21222120210210 is a wasteful number, since it uses less digits than its factorization.

21222120210210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535498280 (or 2535498274 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222120210210 its reverse (1201202122212), we get a palindrome (22423322332422).

The spelling of 21222120210210 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, two hundred ten thousand, two hundred ten".