21220324443 has 24 divisors (see below), whose sum is σ = 32489323776. Its totient is φ = 13300473600.

The previous prime is 21220324441. The next prime is 21220324459. The reversal of 21220324443 is 34442302212.

21220324443 is a `hidden beast` number, since 2 + 12 + 203 + 2 + 4 + 443 = 666.

It is not a de Polignac number, because 21220324443 - 2¹ = 21220324441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220324441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70278 + ... + 217668.

It is an arithmetic number, because the mean of its divisors is an integer number (1353721824).

Almost surely, 2^21220324443 is an apocalyptic number.

21220324443 is a deficient number, since it is larger than the sum of its proper divisors (11268999333).

21220324443 is a wasteful number, since it uses less digits than its factorization.

21220324443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148355 (or 148352 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21220324443 its reverse (34442302212), we get a palindrome (55662626655).

The spelling of 21220324443 in words is "twenty-one billion, two hundred twenty million, three hundred twenty-four thousand, four hundred forty-three".