212021210000121 has 4 divisors (see below), whose sum is σ = 282694946666832. Its totient is φ = 141347473333412.

The previous prime is 212021210000107. The next prime is 212021210000123. The reversal of 212021210000121 is 121000012120212.

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 212021210000121 - 2⁶ = 212021210000057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212021210000121.

It is not an unprimeable number, because it can be changed into a prime (212021210000123) 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, 35336868333351 + ... + 35336868333356.

It is an arithmetic number, because the mean of its divisors is an integer number (70673736666708).

Almost surely, 2^{212021210000121} is an apocalyptic number.

It is an amenable number.

212021210000121 is a deficient number, since it is larger than the sum of its proper divisors (70673736666711).

212021210000121 is an equidigital number, since it uses as much as digits as its factorization.

212021210000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70673736666710.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212021210000121 its reverse (121000012120212), we get a palindrome (333021222120333).

The spelling of 212021210000121 in words is "two hundred twelve trillion, twenty-one billion, two hundred ten million, one hundred twenty-one", and thus it is an aban number.