211121110122121 has 8 divisors (see below), whose sum is σ = 223696430048520. Its totient is φ = 198563171428608.

The previous prime is 211121110122119. The next prime is 211121110122179. The reversal of 211121110122121 is 121221011121112.

It can be written as a sum of positive squares in 4 ways, for example, as 8192538032121 + 202928572090000 = 2862261^2 + 14245300^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211121110122121 - 2¹ = 211121110122119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211121110122191) 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 7 ways as a sum of consecutive naturals, for example, 4345283206 + ... + 4345331791.

It is an arithmetic number, because the mean of its divisors is an integer number (27962053756065).

Almost surely, 2^{211121110122121} is an apocalyptic number.

It is an amenable number.

211121110122121 is a deficient number, since it is larger than the sum of its proper divisors (12575319926399).

211121110122121 is a wasteful number, since it uses less digits than its factorization.

211121110122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8690616443.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 211121110122121 its reverse (121221011121112), we get a palindrome (332342121243233).

The spelling of 211121110122121 in words is "two hundred eleven trillion, one hundred twenty-one billion, one hundred ten million, one hundred twenty-two thousand, one hundred twenty-one".