21202212210210 has 48 divisors (see below), whose sum is σ = 55127812427064. Its totient is φ = 5653711904256.

The previous prime is 21202212210187. The next prime is 21202212210211. The reversal of 21202212210210 is 1201221220212.

It is a happy number.

21202212210210 is a `hidden beast` number, since 2 + 1 + 20 + 221 + 2 + 210 + 210 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 15903896744961 + 5298315465249 = 3987969^2 + 2301807^2 .

It is a super-3 number, since 3×21202212210210³ (a number of 41 digits) contains 333 as substring.

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 (21202212210211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1974777 + ... + 6804716.

Almost surely, 2^{21202212210210} is an apocalyptic number.

21202212210210 is an abundant number, since it is smaller than the sum of its proper divisors (33925600216854).

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

21202212210210 is a wasteful number, since it uses less digits than its factorization.

21202212210210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8806339 (or 8806336 counting only the distinct ones).

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

Adding to 21202212210210 its reverse (1201221220212), we get a palindrome (22403433430422).

The spelling of 21202212210210 in words is "twenty-one trillion, two hundred two billion, two hundred twelve million, two hundred ten thousand, two hundred ten".