211121220020121 has 6 divisors (see below), whose sum is σ = 304952873362410. Its totient is φ = 140747480013408.

The previous prime is 211121220020119. The next prime is 211121220020143. The reversal of 211121220020121 is 121020022121112.

211121220020121 is a `hidden beast` number, since 2 + 111 + 212 + 200 + 20 + 121 = 666.

It can be written as a sum of positive squares in only one way, i.e., 211121219660121 + 360000 = 14530011^2 + 600^2 .

It is not a de Polignac number, because 211121220020121 - 2¹ = 211121220020119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211121220020094 and 211121220020103.

It is not an unprimeable number, because it can be changed into a prime (211121220020101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11728956667776 + ... + 11728956667793.

It is an arithmetic number, because the mean of its divisors is an integer number (50825478893735).

Almost surely, 2^{211121220020121} is an apocalyptic number.

It is an amenable number.

211121220020121 is a deficient number, since it is larger than the sum of its proper divisors (93831653342289).

211121220020121 is a wasteful number, since it uses less digits than its factorization.

211121220020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23457913335575 (or 23457913335572 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211121220020121 its reverse (121020022121112), we get a palindrome (332141242141233).

The spelling of 211121220020121 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred twenty million, twenty thousand, one hundred twenty-one".