210002011222221 has 24 divisors (see below), whose sum is σ = 311538511884600. Its totient is φ = 136215773231616.

The previous prime is 210002011222187. The next prime is 210002011222253. The reversal of 210002011222221 is 122222110200012.

It is a happy number.

210002011222221 is a `hidden beast` number, since 21 + 0 + 0 + 0 + 201 + 1 + 222 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 46047149498025 + 163954861724196 = 6785805^2 + 12804486^2 .

It is not a de Polignac number, because 210002011222221 - 2⁷ = 210002011222093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210002011222194 and 210002011222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210002011222321) 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, 22205505 + ... + 30217353.

It is an arithmetic number, because the mean of its divisors is an integer number (12980771328525).

Almost surely, 2^{210002011222221} is an apocalyptic number.

It is an amenable number.

210002011222221 is a deficient number, since it is larger than the sum of its proper divisors (101536500662379).

210002011222221 is a wasteful number, since it uses less digits than its factorization.

210002011222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8090605 (or 8090602 counting only the distinct ones).

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

Adding to 210002011222221 its reverse (122222110200012), we get a palindrome (332224121422233).

The spelling of 210002011222221 in words is "two hundred ten trillion, two billion, eleven million, two hundred twenty-two thousand, two hundred twenty-one".