212120012221 has 16 divisors (see below), whose sum is σ = 238437521280. Its totient is φ = 187236054720.

The previous prime is 212120012201. The next prime is 212120012233. The reversal of 212120012221 is 122210021212.

It is a happy number.

It is not a de Polignac number, because 212120012221 - 2¹¹ = 212120010173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212120012195 and 212120012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120012201) 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, 957931 + ... + 1158391.

It is an arithmetic number, because the mean of its divisors is an integer number (14902345080).

Almost surely, 2^212120012221 is an apocalyptic number.

It is an amenable number.

212120012221 is a deficient number, since it is larger than the sum of its proper divisors (26317509059).

212120012221 is a wasteful number, since it uses less digits than its factorization.

212120012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204036.

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

Adding to 212120012221 its reverse (122210021212), we get a palindrome (334330033433).

The spelling of 212120012221 in words is "two hundred twelve billion, one hundred twenty million, twelve thousand, two hundred twenty-one".