210221010211221 has 12 divisors (see below), whose sum is σ = 316854855970848. Its totient is φ = 134053977525864.

The previous prime is 210221010211207. The next prime is 210221010211291. The reversal of 210221010211221 is 122112010122012.

210221010211221 is a `hidden beast` number, since 2 + 1 + 0 + 221 + 0 + 10 + 211 + 221 = 666.

It is not a de Polignac number, because 210221010211221 - 2⁵ = 210221010211189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210221010211194 and 210221010211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221010211291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 507780217695 + ... + 507780218108.

It is an arithmetic number, because the mean of its divisors is an integer number (26404571330904).

Almost surely, 2^{210221010211221} is an apocalyptic number.

It is an amenable number.

210221010211221 is a deficient number, since it is larger than the sum of its proper divisors (106633845759627).

210221010211221 is a wasteful number, since it uses less digits than its factorization.

210221010211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015560435832 (or 1015560435829 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 210221010211221 its reverse (122112010122012), we get a palindrome (332333020333233).

The spelling of 210221010211221 in words is "two hundred ten trillion, two hundred twenty-one billion, ten million, two hundred eleven thousand, two hundred twenty-one".