21446533564411 has 4 divisors (see below), whose sum is σ = 21851185141152. Its totient is φ = 21041881987672.

The previous prime is 21446533564399. The next prime is 21446533564447. The reversal of 21446533564411 is 11446533564412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21446533564411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21446533564711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202325788291 + ... + 202325788396.

It is an arithmetic number, because the mean of its divisors is an integer number (5462796285288).

Almost surely, 2^{21446533564411} is an apocalyptic number.

21446533564411 is a deficient number, since it is larger than the sum of its proper divisors (404651576741).

21446533564411 is an equidigital number, since it uses as much as digits as its factorization.

21446533564411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404651576740.

The product of its digits is 4147200, while the sum is 49.

Subtracting from 21446533564411 its reverse (11446533564412), we obtain a palindrome (9999999999999).

The spelling of 21446533564411 in words is "twenty-one trillion, four hundred forty-six billion, five hundred thirty-three million, five hundred sixty-four thousand, four hundred eleven".