20002011121 has 4 divisors (see below), whose sum is σ = 20021641200. Its totient is φ = 19982381044.

The previous prime is 20002011103. The next prime is 20002011137. The reversal of 20002011121 is 12111020002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12111020002 = 2 ⋅6055510001.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20002011121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002011098 and 20002011107.

It is not an unprimeable number, because it can be changed into a prime (20002014121) 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 3 ways as a sum of consecutive naturals, for example, 9813511 + ... + 9815548.

It is an arithmetic number, because the mean of its divisors is an integer number (5005410300).

Almost surely, 2^20002011121 is an apocalyptic number.

It is an amenable number.

20002011121 is a deficient number, since it is larger than the sum of its proper divisors (19630079).

20002011121 is a wasteful number, since it uses less digits than its factorization.

20002011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19630078.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20002011121 its reverse (12111020002), we get a palindrome (32113031123).

The spelling of 20002011121 in words is "twenty billion, two million, eleven thousand, one hundred twenty-one".