21443545201205 has 32 divisors (see below), whose sum is σ = 27745049180160. Its totient is φ = 15873368797440.

The previous prime is 21443545201171. The next prime is 21443545201219. The reversal of 21443545201205 is 50210254534412.

It is a de Polignac number, because none of the positive numbers 2^k-21443545201205 is a prime.

It is a super-2 number, since 2×21443545201205² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 22694942 + ... + 23620911.

It is an arithmetic number, because the mean of its divisors is an integer number (867032786880).

Almost surely, 2^{21443545201205} is an apocalyptic number.

It is an amenable number.

21443545201205 is a deficient number, since it is larger than the sum of its proper divisors (6301503978955).

21443545201205 is a wasteful number, since it uses less digits than its factorization.

21443545201205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46316021.

The product of its (nonzero) digits is 192000, while the sum is 38.

Adding to 21443545201205 its reverse (50210254534412), we get a palindrome (71653799735617).

The spelling of 21443545201205 in words is "twenty-one trillion, four hundred forty-three billion, five hundred forty-five million, two hundred one thousand, two hundred five".