20121010211121 has 16 divisors (see below), whose sum is σ = 27080450198784. Its totient is φ = 13287804325904.

The previous prime is 20121010211111. The next prime is 20121010211143. The reversal of 20121010211121 is 12111201012102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20121010211121 - 2¹¹ = 20121010209073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20121010211121.

It is not an unprimeable number, because it can be changed into a prime (20121010211101) 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 15 ways as a sum of consecutive naturals, for example, 3142990 + ... + 7079576.

It is an arithmetic number, because the mean of its divisors is an integer number (1692528137424).

Almost surely, 2^{20121010211121} is an apocalyptic number.

It is an amenable number.

20121010211121 is a deficient number, since it is larger than the sum of its proper divisors (6959439987663).

20121010211121 is a wasteful number, since it uses less digits than its factorization.

20121010211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3952620.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20121010211121 its reverse (12111201012102), we get a palindrome (32232211223223).

The spelling of 20121010211121 in words is "twenty trillion, one hundred twenty-one billion, ten million, two hundred eleven thousand, one hundred twenty-one".