20121111201 has 8 divisors (see below), whose sum is σ = 26831585664. Its totient is φ = 13412355440.

The previous prime is 20121111191. The next prime is 20121111221. The reversal of 20121111201 is 10211112102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121111201 - 2²⁶ = 20054002337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121111221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402105 + ... + 449366.

It is an arithmetic number, because the mean of its divisors is an integer number (3353948208).

Almost surely, 2^20121111201 is an apocalyptic number.

It is an amenable number.

20121111201 is a deficient number, since it is larger than the sum of its proper divisors (6710474463).

20121111201 is an equidigital number, since it uses as much as digits as its factorization.

20121111201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859351.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20121111201 its reverse (10211112102), we get a palindrome (30332223303).

Subtracting from 20121111201 its reverse (10211112102), we obtain a palindrome (9909999099).

The spelling of 20121111201 in words is "twenty billion, one hundred twenty-one million, one hundred eleven thousand, two hundred one".