210202001221221 has 12 divisors (see below), whose sum is σ = 303803821027200. Its totient is φ = 140052186795240.

The previous prime is 210202001221187. The next prime is 210202001221237. The reversal of 210202001221221 is 122122100202012.

It is a happy number.

210202001221221 is a `hidden beast` number, since 2 + 1 + 0 + 20 + 200 + 1 + 221 + 221 = 666.

It is not a de Polignac number, because 210202001221221 - 2⁹ = 210202001220709 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210202001221194 and 210202001221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210202001222221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6873374325 + ... + 6873404906.

It is an arithmetic number, because the mean of its divisors is an integer number (25316985085600).

Almost surely, 2^{210202001221221} is an apocalyptic number.

It is an amenable number.

210202001221221 is a deficient number, since it is larger than the sum of its proper divisors (93601819805979).

210202001221221 is a wasteful number, since it uses less digits than its factorization.

210202001221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13746780936 (or 13746780933 counting only the distinct ones).

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

Adding to 210202001221221 its reverse (122122100202012), we get a palindrome (332324101423233).

The spelling of 210202001221221 in words is "two hundred ten trillion, two hundred two billion, one million, two hundred twenty-one thousand, two hundred twenty-one".