212020121121 has 4 divisors (see below), whose sum is σ = 282693494832. Its totient is φ = 141346747412.

The previous prime is 212020121101. The next prime is 212020121149. The reversal of 212020121121 is 121121020212.

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 212020121121 - 2¹⁸ = 212019858977 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212020121121.

It is not an unprimeable number, because it can be changed into a prime (212020121101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35336686851 + ... + 35336686856.

It is an arithmetic number, because the mean of its divisors is an integer number (70673373708).

Almost surely, 2^212020121121 is an apocalyptic number.

It is an amenable number.

212020121121 is a deficient number, since it is larger than the sum of its proper divisors (70673373711).

212020121121 is an equidigital number, since it uses as much as digits as its factorization.

212020121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70673373710.

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

Adding to 212020121121 its reverse (121121020212), we get a palindrome (333141141333).

The spelling of 212020121121 in words is "two hundred twelve billion, twenty million, one hundred twenty-one thousand, one hundred twenty-one".