20001121022011 has 4 divisors (see below), whose sum is σ = 20001131971192. Its totient is φ = 20001110072832.

The previous prime is 20001121021967. The next prime is 20001121022059. The reversal of 20001121022011 is 11022012110002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20001121022011 - 2⁹ = 20001121021499 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001121021982 and 20001121022000.

It is not an unprimeable number, because it can be changed into a prime (20001121022081) 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, 1999005 + ... + 6633118.

It is an arithmetic number, because the mean of its divisors is an integer number (5000282992798).

Almost surely, 2^{20001121022011} is an apocalyptic number.

20001121022011 is a deficient number, since it is larger than the sum of its proper divisors (10949181).

20001121022011 is an equidigital number, since it uses as much as digits as its factorization.

20001121022011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10949180.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20001121022011 its reverse (11022012110002), we get a palindrome (31023133132013).

The spelling of 20001121022011 in words is "twenty trillion, one billion, one hundred twenty-one million, twenty-two thousand, eleven".