212001212100221 has 16 divisors (see below), whose sum is σ = 218075032304640. Its totient is φ = 206011263635520.

The previous prime is 212001212100193. The next prime is 212001212100239. The reversal of 212001212100221 is 122001212100212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212001212100221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212001212100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212001212900221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 709019876 + ... + 709318818.

It is an arithmetic number, because the mean of its divisors is an integer number (13629689519040).

Almost surely, 2^{212001212100221} is an apocalyptic number.

It is an amenable number.

212001212100221 is a deficient number, since it is larger than the sum of its proper divisors (6073820204419).

212001212100221 is a wasteful number, since it uses less digits than its factorization.

212001212100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439156.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212001212100221 its reverse (122001212100212), we get a palindrome (334002424200433).

Subtracting from 212001212100221 its reverse (122001212100212), we obtain a palindrome (90000000000009).

The spelling of 212001212100221 in words is "two hundred twelve trillion, one billion, two hundred twelve million, one hundred thousand, two hundred twenty-one".