212120002100221 has 4 divisors (see below), whose sum is σ = 212121278107200. Its totient is φ = 212118726093244.

The previous prime is 212120002100213. The next prime is 212120002100327. The reversal of 212120002100221 is 122001200021212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212120002100221 - 2³ = 212120002100213 is a prime.

It is a super-2 number, since 2×212120002100221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212120002100195 and 212120002100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120002100921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637754101 + ... + 638086618.

It is an arithmetic number, because the mean of its divisors is an integer number (53030319526800).

Almost surely, 2^{212120002100221} is an apocalyptic number.

It is an amenable number.

212120002100221 is a deficient number, since it is larger than the sum of its proper divisors (1276006979).

212120002100221 is a wasteful number, since it uses less digits than its factorization.

212120002100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276006978.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212120002100221 its reverse (122001200021212), we get a palindrome (334121202121433).

The spelling of 212120002100221 in words is "two hundred twelve trillion, one hundred twenty billion, two million, one hundred thousand, two hundred twenty-one".