210122112100221 has 6 divisors (see below), whose sum is σ = 303509717478110. Its totient is φ = 140081408066808.

The previous prime is 210122112100141. The next prime is 210122112100259. The reversal of 210122112100221 is 122001211221012.

210122112100221 is a `hidden beast` number, since 2 + 10 + 1 + 221 + 1 + 210 + 0 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 113158427384025 + 96963684716196 = 10637595^2 + 9847014^2 .

It is not a de Polignac number, because 210122112100221 - 2¹⁸ = 210122111838077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210122112100194 and 210122112100203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210122112100291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11673450672226 + ... + 11673450672243.

Almost surely, 2^{210122112100221} is an apocalyptic number.

It is an amenable number.

210122112100221 is a deficient number, since it is larger than the sum of its proper divisors (93387605377889).

210122112100221 is a wasteful number, since it uses less digits than its factorization.

210122112100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23346901344475 (or 23346901344472 counting only the distinct ones).

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

Adding to 210122112100221 its reverse (122001211221012), we get a palindrome (332123323321233).

The spelling of 210122112100221 in words is "two hundred ten trillion, one hundred twenty-two billion, one hundred twelve million, one hundred thousand, two hundred twenty-one".