20001012111021 has 4 divisors (see below), whose sum is σ = 26668016148032. Its totient is φ = 13334008074012.

The previous prime is 20001012111019. The next prime is 20001012111049. The reversal of 20001012111021 is 12011121010002.

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.

It is not a de Polignac number, because 20001012111021 - 2¹ = 20001012111019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001012110988 and 20001012111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001012111011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3333502018501 + ... + 3333502018506.

It is an arithmetic number, because the mean of its divisors is an integer number (6667004037008).

Almost surely, 2^{20001012111021} is an apocalyptic number.

It is an amenable number.

20001012111021 is a deficient number, since it is larger than the sum of its proper divisors (6667004037011).

20001012111021 is an equidigital number, since it uses as much as digits as its factorization.

20001012111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6667004037010.

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

Adding to 20001012111021 its reverse (12011121010002), we get a palindrome (32012133121023).

The spelling of 20001012111021 in words is "twenty trillion, one billion, twelve million, one hundred eleven thousand, twenty-one".