212100222121 has 8 divisors (see below), whose sum is σ = 216473840640. Its totient is φ = 207752560368.

The previous prime is 212100222049. The next prime is 212100222151. The reversal of 212100222121 is 121222001212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212100222121 - 2¹³ = 212100213929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212100222095 and 212100222104.

It is not an unprimeable number, because it can be changed into a prime (212100222151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6472681 + ... + 6505366.

It is an arithmetic number, because the mean of its divisors is an integer number (27059230080).

Almost surely, 2^212100222121 is an apocalyptic number.

It is an amenable number.

212100222121 is a deficient number, since it is larger than the sum of its proper divisors (4373618519).

212100222121 is a wasteful number, since it uses less digits than its factorization.

212100222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12978383.

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

Adding to 212100222121 its reverse (121222001212), we get a palindrome (333322223333).

The spelling of 212100222121 in words is "two hundred twelve billion, one hundred million, two hundred twenty-two thousand, one hundred twenty-one".