212021010020121 has 16 divisors (see below), whose sum is σ = 289554360748800. Its totient is φ = 137951970410448.

The previous prime is 212021010020081. The next prime is 212021010020167. The reversal of 212021010020121 is 121020010120212.

It is not a de Polignac number, because 212021010020121 - 2³⁸ = 211746132113177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212021010020121.

It is not an unprimeable number, because it can be changed into a prime (212021010020021) 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, 4308820051 + ... + 4308869256.

It is an arithmetic number, because the mean of its divisors is an integer number (18097147546800).

Almost surely, 2^{212021010020121} is an apocalyptic number.

It is an amenable number.

212021010020121 is a deficient number, since it is larger than the sum of its proper divisors (77533350728679).

212021010020121 is a wasteful number, since it uses less digits than its factorization.

212021010020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8617689508.

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

Adding to 212021010020121 its reverse (121020010120212), we get a palindrome (333041020140333).

The spelling of 212021010020121 in words is "two hundred twelve trillion, twenty-one billion, ten million, twenty thousand, one hundred twenty-one".