212012221102121 has 4 divisors (see below), whose sum is σ = 231286059384144. Its totient is φ = 192738382820100.

The previous prime is 212012221102049. The next prime is 212012221102159. The reversal of 212012221102121 is 121201122210212.

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 212012221102121 - 2¹⁸ = 212012220839977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212012221102093 and 212012221102102.

It is not an unprimeable number, because it can be changed into a prime (212012221102021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9636919140995 + ... + 9636919141016.

It is an arithmetic number, because the mean of its divisors is an integer number (57821514846036).

Almost surely, 2^{212012221102121} is an apocalyptic number.

It is an amenable number.

212012221102121 is a deficient number, since it is larger than the sum of its proper divisors (19273838282023).

212012221102121 is a wasteful number, since it uses less digits than its factorization.

212012221102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19273838282022.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 212012221102121 its reverse (121201122210212), we get a palindrome (333213343312333).

The spelling of 212012221102121 in words is "two hundred twelve trillion, twelve billion, two hundred twenty-one million, one hundred two thousand, one hundred twenty-one".