201210122121 has 16 divisors (see below), whose sum is σ = 271741708800. Its totient is φ = 132414277248.

The previous prime is 201210122077. The next prime is 201210122213. The reversal of 201210122121 is 121221012102.

It is not a de Polignac number, because 201210122121 - 2²⁶ = 201143013257 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 201210122121.

It is not an unprimeable number, because it can be changed into a prime (201210322121) 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, 458686 + ... + 782823.

It is an arithmetic number, because the mean of its divisors is an integer number (16983856800).

Almost surely, 2^201210122121 is an apocalyptic number.

It is an amenable number.

201210122121 is a deficient number, since it is larger than the sum of its proper divisors (70531586679).

201210122121 is a wasteful number, since it uses less digits than its factorization.

201210122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242208.

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

Adding to 201210122121 its reverse (121221012102), we get a palindrome (322431134223).

The spelling of 201210122121 in words is "two hundred one billion, two hundred ten million, one hundred twenty-two thousand, one hundred twenty-one".