21202144443 has 8 divisors (see below), whose sum is σ = 31410584400. Its totient is φ = 14134762944.

The previous prime is 21202144421. The next prime is 21202144459. The reversal of 21202144443 is 34444120212.

21202144443 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 214 + 4 + 443 = 666.

It is not a de Polignac number, because 21202144443 - 2⁹ = 21202143931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 785264609 = 21202144443 / (2 + 1 + 2 + 0 + 2 + 1 + 4 + 4 + 4 + 4 + 3).

It is not an unprimeable number, because it can be changed into a prime (21202164443) 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 7 ways as a sum of consecutive naturals, for example, 392632278 + ... + 392632331.

It is an arithmetic number, because the mean of its divisors is an integer number (3926323050).

Almost surely, 2^21202144443 is an apocalyptic number.

21202144443 is a deficient number, since it is larger than the sum of its proper divisors (10208439957).

21202144443 is an equidigital number, since it uses as much as digits as its factorization.

21202144443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785264618 (or 785264612 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21202144443 its reverse (34444120212), we get a palindrome (55646264655).

The spelling of 21202144443 in words is "twenty-one billion, two hundred two million, one hundred forty-four thousand, four hundred forty-three".