212102202121 has 4 divisors (see below), whose sum is σ = 212106544144. Its totient is φ = 212097860100.

The previous prime is 212102202119. The next prime is 212102202139. The reversal of 212102202121 is 121202201212.

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 212102202121 - 2¹ = 212102202119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212102202095 and 212102202104.

It is not an unprimeable number, because it can be changed into a prime (212102202721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2096895 + ... + 2195716.

It is an arithmetic number, because the mean of its divisors is an integer number (53026636036).

Almost surely, 2^212102202121 is an apocalyptic number.

It is an amenable number.

212102202121 is a deficient number, since it is larger than the sum of its proper divisors (4342023).

212102202121 is an equidigital number, since it uses as much as digits as its factorization.

212102202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4342022.

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

Adding to 212102202121 its reverse (121202201212), we get a palindrome (333304403333).

Subtracting from 212102202121 its reverse (121202201212), we obtain a palindrome (90900000909).

The spelling of 212102202121 in words is "two hundred twelve billion, one hundred two million, two hundred two thousand, one hundred twenty-one".