20411333256021 has 16 divisors (see below), whose sum is σ = 27588894528960. Its totient is φ = 13420676903040.

The previous prime is 20411333256011. The next prime is 20411333256029. The reversal of 20411333256021 is 12065233311402.

It is not a de Polignac number, because 20411333256021 - 2⁷ = 20411333255893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20411333256029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4628191 + ... + 7889411.

It is an arithmetic number, because the mean of its divisors is an integer number (1724305908060).

Almost surely, 2^{20411333256021} is an apocalyptic number.

It is an amenable number.

20411333256021 is a deficient number, since it is larger than the sum of its proper divisors (7177561272939).

20411333256021 is a wasteful number, since it uses less digits than its factorization.

20411333256021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3289876.

The product of its (nonzero) digits is 25920, while the sum is 33.

Adding to 20411333256021 its reverse (12065233311402), we get a palindrome (32476566567423).

The spelling of 20411333256021 in words is "twenty trillion, four hundred eleven billion, three hundred thirty-three million, two hundred fifty-six thousand, twenty-one".