212110211020121 has 4 divisors (see below), whose sum is σ = 214296914226612. Its totient is φ = 209923507813632.

The previous prime is 212110211020111. The next prime is 212110211020151. The reversal of 212110211020121 is 121020112011212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 155047597179721 + 57062613840400 = 12451811^2 + 7553980^2 .

It is a cyclic number.

It is not a de Polignac number, because 212110211020121 - 2¹⁰ = 212110211019097 is a prime.

It is a super-3 number, since 3×212110211020121³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 212110211020121.

It is not an unprimeable number, because it can be changed into a prime (212110211020111) 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, 1093351603100 + ... + 1093351603293.

It is an arithmetic number, because the mean of its divisors is an integer number (53574228556653).

Almost surely, 2^{212110211020121} is an apocalyptic number.

It is an amenable number.

212110211020121 is a deficient number, since it is larger than the sum of its proper divisors (2186703206491).

212110211020121 is an equidigital number, since it uses as much as digits as its factorization.

212110211020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2186703206490.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 212110211020121 its reverse (121020112011212), we get a palindrome (333130323031333).

The spelling of 212110211020121 in words is "two hundred twelve trillion, one hundred ten billion, two hundred eleven million, twenty thousand, one hundred twenty-one".