212111020121 has 48 divisors (see below), whose sum is σ = 293135915520. Its totient is φ = 150852683520.

The previous prime is 212111020111. The next prime is 212111020129. The reversal of 212111020121 is 121020111212.

It is not a de Polignac number, because 212111020121 - 2¹⁰ = 212111019097 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212111020096 and 212111020105.

It is not an unprimeable number, because it can be changed into a prime (212111020129) 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 47 ways as a sum of consecutive naturals, for example, 453560 + ... + 793686.

It is an arithmetic number, because the mean of its divisors is an integer number (6106998240).

Almost surely, 2^212111020121 is an apocalyptic number.

It is an amenable number.

212111020121 is a deficient number, since it is larger than the sum of its proper divisors (81024895399).

212111020121 is a wasteful number, since it uses less digits than its factorization.

212111020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340254 (or 340247 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 212111020121 its reverse (121020111212), we get a palindrome (333131131333).

The spelling of 212111020121 in words is "two hundred twelve billion, one hundred eleven million, twenty thousand, one hundred twenty-one".