21200443489 has 4 divisors (see below), whose sum is σ = 21200735920. Its totient is φ = 21200151060.

The previous prime is 21200443477. The next prime is 21200443493. The reversal of 21200443489 is 98434400212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21200443489 - 2¹⁹ = 21199919201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200443889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53074 + ... + 212644.

It is an arithmetic number, because the mean of its divisors is an integer number (5300183980).

Almost surely, 2^21200443489 is an apocalyptic number.

It is an amenable number.

21200443489 is a deficient number, since it is larger than the sum of its proper divisors (292431).

21200443489 is a wasteful number, since it uses less digits than its factorization.

21200443489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292430.

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 21200443489 in words is "twenty-one billion, two hundred million, four hundred forty-three thousand, four hundred eighty-nine".