212112202121 has 16 divisors (see below), whose sum is σ = 215901967104. Its totient is φ = 208341686784.

The previous prime is 212112202117. The next prime is 212112202199. The reversal of 212112202121 is 121202211212.

It is a cyclic number.

It is not a de Polignac number, because 212112202121 - 2² = 212112202117 is a prime.

It is a super-3 number, since 3×212112202121³ (a number of 35 digits) contains 333 as substring.

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 212112202121.

It is not an unprimeable number, because it can be changed into a prime (212112207121) 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, 41160281 + ... + 41165433.

It is an arithmetic number, because the mean of its divisors is an integer number (13493872944).

Almost surely, 2^212112202121 is an apocalyptic number.

It is an amenable number.

212112202121 is a deficient number, since it is larger than the sum of its proper divisors (3789764983).

212112202121 is a wasteful number, since it uses less digits than its factorization.

212112202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6880.

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

Adding to 212112202121 its reverse (121202211212), we get a palindrome (333314413333).

Subtracting from 212112202121 its reverse (121202211212), we obtain a palindrome (90909990909).

The spelling of 212112202121 in words is "two hundred twelve billion, one hundred twelve million, two hundred two thousand, one hundred twenty-one".