20011000121 has 32 divisors (see below), whose sum is σ = 23514624000. Its totient is φ = 16676674560.

The previous prime is 20011000111. The next prime is 20011000147. The reversal of 20011000121 is 12100011002.

It is not a de Polignac number, because 20011000121 - 2⁶ = 20011000057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011000099 and 20011000108.

It is not an unprimeable number, because it can be changed into a prime (20011000111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20608166 + ... + 20609136.

It is an arithmetic number, because the mean of its divisors is an integer number (734832000).

Almost surely, 2^20011000121 is an apocalyptic number.

It is an amenable number.

20011000121 is a deficient number, since it is larger than the sum of its proper divisors (3503623879).

20011000121 is an equidigital number, since it uses as much as digits as its factorization.

20011000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20011000121 its reverse (12100011002), we get a palindrome (32111011123).

The spelling of 20011000121 in words is "twenty billion, eleven million, one hundred twenty-one", and thus it is an aban number.