212101000101221 has 32 divisors (see below), whose sum is σ = 265997965658880. Its totient is φ = 164298967142400.

The previous prime is 212101000101191. The next prime is 212101000101227. The reversal of 212101000101221 is 122101000101212.

It is a cyclic number.

It is not a de Polignac number, because 212101000101221 - 2¹⁴ = 212101000084837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212101000101196 and 212101000101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101000101227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34466885 + ... + 40151813.

It is an arithmetic number, because the mean of its divisors is an integer number (8312436426840).

Almost surely, 2^{212101000101221} is an apocalyptic number.

It is an amenable number.

212101000101221 is a deficient number, since it is larger than the sum of its proper divisors (53896965557659).

212101000101221 is a wasteful number, since it uses less digits than its factorization.

212101000101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5687805.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 212101000101221 its reverse (122101000101212), we get a palindrome (334202000202433).

Subtracting from 212101000101221 its reverse (122101000101212), we obtain a palindrome (90000000000009).

The spelling of 212101000101221 in words is "two hundred twelve trillion, one hundred one billion, one hundred one thousand, two hundred twenty-one".