20001000121 has 8 divisors (see below), whose sum is σ = 20065971744. Its totient is φ = 19936076160.

The previous prime is 20001000109. The next prime is 20001000181. The reversal of 20001000121 is 12100010002.

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 20001000121 - 2²⁵ = 19967445689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001000181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 953670 + ... + 974416.

It is an arithmetic number, because the mean of its divisors is an integer number (2508246468).

Almost surely, 2^20001000121 is an apocalyptic number.

It is an amenable number.

20001000121 is a deficient number, since it is larger than the sum of its proper divisors (64971623).

20001000121 is a wasteful number, since it uses less digits than its factorization.

20001000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23831.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 20001000121 its reverse (12100010002), we get a palindrome (32101010123).

The spelling of 20001000121 in words is "twenty billion, one million, one hundred twenty-one", and thus it is an aban number.