212110102120221 has 6 divisors (see below), whose sum is σ = 306381258618110. Its totient is φ = 141406734746808.

The previous prime is 212110102120201. The next prime is 212110102120223. The reversal of 212110102120221 is 122021201011212.

212110102120221 is a `hidden beast` number, since 21 + 211 + 0 + 1 + 0 + 212 + 0 + 221 = 666.

212110102120221 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 163717015088025 + 48393087032196 = 12795195^2 + 6956514^2 .

It is not a de Polignac number, because 212110102120221 - 2¹⁹ = 212110101595933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212110102120194 and 212110102120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212110102120223) 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, 11783894562226 + ... + 11783894562243.

Almost surely, 2^{212110102120221} is an apocalyptic number.

It is an amenable number.

212110102120221 is a deficient number, since it is larger than the sum of its proper divisors (94271156497889).

212110102120221 is a wasteful number, since it uses less digits than its factorization.

212110102120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23567789124475 (or 23567789124472 counting only the distinct ones).

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

Adding to 212110102120221 its reverse (122021201011212), we get a palindrome (334131303131433).

The spelling of 212110102120221 in words is "two hundred twelve trillion, one hundred ten billion, one hundred two million, one hundred twenty thousand, two hundred twenty-one".