212100111202221 has 24 divisors (see below), whose sum is σ = 334738136861856. Its totient is φ = 128345606627040.

The previous prime is 212100111202211. The next prime is 212100111202279. The reversal of 212100111202221 is 122202111001212.

212100111202221 is a `hidden beast` number, since 21 + 210 + 0 + 1 + 11 + 202 + 221 = 666.

It is not a de Polignac number, because 212100111202221 - 2⁶ = 212100111202157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212100111202194 and 212100111202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100111202201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1665896970 + ... + 1666024283.

It is an arithmetic number, because the mean of its divisors is an integer number (13947422369244).

Almost surely, 2^{212100111202221} is an apocalyptic number.

It is an amenable number.

212100111202221 is a deficient number, since it is larger than the sum of its proper divisors (122638025659635).

212100111202221 is a wasteful number, since it uses less digits than its factorization.

212100111202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331921913 (or 3331921910 counting only the distinct ones).

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

Adding to 212100111202221 its reverse (122202111001212), we get a palindrome (334302222203433).

The spelling of 212100111202221 in words is "two hundred twelve trillion, one hundred billion, one hundred eleven million, two hundred two thousand, two hundred twenty-one".