21744444219 has 4 divisors (see below), whose sum is σ = 28992592296. Its totient is φ = 14496296144.

The previous prime is 21744444107. The next prime is 21744444223. The reversal of 21744444219 is 91244444712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21744444219 is a prime.

It is a super-2 number, since 2×21744444219² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21744444299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3624074034 + ... + 3624074039.

It is an arithmetic number, because the mean of its divisors is an integer number (7248148074).

Almost surely, 2^21744444219 is an apocalyptic number.

21744444219 is a deficient number, since it is larger than the sum of its proper divisors (7248148077).

21744444219 is an equidigital number, since it uses as much as digits as its factorization.

21744444219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7248148076.

The product of its digits is 258048, while the sum is 42.

The spelling of 21744444219 in words is "twenty-one billion, seven hundred forty-four million, four hundred forty-four thousand, two hundred nineteen".