201121022121 has 16 divisors (see below), whose sum is σ = 268675789440. Its totient is φ = 133823612160.

The previous prime is 201121022099. The next prime is 201121022173. The reversal of 201121022121 is 121220121102.

It is not a de Polignac number, because 201121022121 - 2⁹ = 201121021609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201121022121.

It is not an unprimeable number, because it can be changed into a prime (201121022321) 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, 6255475 + ... + 6287543.

It is an arithmetic number, because the mean of its divisors is an integer number (16792236840).

Almost surely, 2^201121022121 is an apocalyptic number.

It is an amenable number.

201121022121 is a deficient number, since it is larger than the sum of its proper divisors (67554767319).

201121022121 is a wasteful number, since it uses less digits than its factorization.

201121022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36016.

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

Adding to 201121022121 its reverse (121220121102), we get a palindrome (322341143223).

The spelling of 201121022121 in words is "two hundred one billion, one hundred twenty-one million, twenty-two thousand, one hundred twenty-one".