20121001121 has 8 divisors (see below), whose sum is σ = 22809232320. Its totient is φ = 17595693072.

The previous prime is 20121001111. The next prime is 20121001157. The reversal of 20121001121 is 12110012102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121001121 is a prime.

It is a super-2 number, since 2×20121001121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20121001111) 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 7 ways as a sum of consecutive naturals, for example, 40730525 + ... + 40731018.

It is an arithmetic number, because the mean of its divisors is an integer number (2851154040).

Almost surely, 2^20121001121 is an apocalyptic number.

It is an amenable number.

20121001121 is a deficient number, since it is larger than the sum of its proper divisors (2688231199).

20121001121 is a wasteful number, since it uses less digits than its factorization.

20121001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81461575.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20121001121 its reverse (12110012102), we get a palindrome (32231013223).

The spelling of 20121001121 in words is "twenty billion, one hundred twenty-one million, one thousand, one hundred twenty-one".