212110121221 has 8 divisors (see below), whose sum is σ = 214506671040. Its totient is φ = 209713866912.

The previous prime is 212110121203. The next prime is 212110121291. The reversal of 212110121221 is 122121011212.

212110121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212110121221 - 2¹⁵ = 212110088453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212110121195 and 212110121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212110121291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1576816 + ... + 1706038.

It is an arithmetic number, because the mean of its divisors is an integer number (26813333880).

Almost surely, 2^212110121221 is an apocalyptic number.

It is an amenable number.

212110121221 is a deficient number, since it is larger than the sum of its proper divisors (2396549819).

212110121221 is a wasteful number, since it uses less digits than its factorization.

212110121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147755.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212110121221 its reverse (122121011212), we get a palindrome (334231132433).

The spelling of 212110121221 in words is "two hundred twelve billion, one hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".