21744444218 has 128 divisors (see below), whose sum is σ = 41542502400. Its totient is φ = 8325273600.

The previous prime is 21744444107. The next prime is 21744444223. The reversal of 21744444218 is 81244444712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 103054133 + ... + 103054343.

It is an arithmetic number, because the mean of its divisors is an integer number (324550800).

Almost surely, 2^21744444218 is an apocalyptic number.

21744444218 is a deficient number, since it is larger than the sum of its proper divisors (19798058182).

21744444218 is a wasteful number, since it uses less digits than its factorization.

21744444218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516.

The product of its digits is 229376, while the sum is 41.

The spelling of 21744444218 in words is "twenty-one billion, seven hundred forty-four million, four hundred forty-four thousand, two hundred eighteen".