20443443321 has 24 divisors (see below), whose sum is σ = 31785817440. Its totient is φ = 11653371072.

The previous prime is 20443443299. The next prime is 20443443323. The reversal of 20443443321 is 12334434402.

It is a happy number.

It is not a de Polignac number, because 20443443321 - 2⁹ = 20443442809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20443443323) 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, 109891 + ... + 230136.

It is an arithmetic number, because the mean of its divisors is an integer number (1324409060).

Almost surely, 2^20443443321 is an apocalyptic number.

20443443321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20443443321 is a deficient number, since it is larger than the sum of its proper divisors (11342374119).

20443443321 is a wasteful number, since it uses less digits than its factorization.

20443443321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340453 (or 340446 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 20443443321 its reverse (12334434402), we get a palindrome (32777877723).

The spelling of 20443443321 in words is "twenty billion, four hundred forty-three million, four hundred forty-three thousand, three hundred twenty-one".