210002122021221 has 6 divisors (see below), whose sum is σ = 303336398475110. Its totient is φ = 140001414680808.

The previous prime is 210002122021157. The next prime is 210002122021247. The reversal of 210002122021221 is 122120221200012.

It is a happy number.

210002122021221 is a `hidden beast` number, since 210 + 0 + 0 + 2 + 1 + 220 + 212 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 190256807676321 + 19745314344900 = 13793361^2 + 4443570^2 .

It is not a de Polignac number, because 210002122021221 - 2⁶ = 210002122021157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210002122021194 and 210002122021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210002122021271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11666784556726 + ... + 11666784556743.

Almost surely, 2^{210002122021221} is an apocalyptic number.

It is an amenable number.

210002122021221 is a deficient number, since it is larger than the sum of its proper divisors (93334276453889).

210002122021221 is a wasteful number, since it uses less digits than its factorization.

210002122021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23333569113475 (or 23333569113472 counting only the distinct ones).

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

Adding to 210002122021221 its reverse (122120221200012), we get a palindrome (332122343221233).

The spelling of 210002122021221 in words is "two hundred ten trillion, two billion, one hundred twenty-two million, twenty-one thousand, two hundred twenty-one".