21440043111 has 8 divisors (see below), whose sum is σ = 28612184320. Its totient is φ = 14280631992.

The previous prime is 21440043109. The next prime is 21440043127. The reversal of 21440043111 is 11134004412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21440043111 - 2¹ = 21440043109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440043151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3178591 + ... + 3185328.

It is an arithmetic number, because the mean of its divisors is an integer number (3576523040).

Almost surely, 2^21440043111 is an apocalyptic number.

21440043111 is a deficient number, since it is larger than the sum of its proper divisors (7172141209).

21440043111 is a wasteful number, since it uses less digits than its factorization.

21440043111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6365045.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21440043111 its reverse (11134004412), we get a palindrome (32574047523).

The spelling of 21440043111 in words is "twenty-one billion, four hundred forty million, forty-three thousand, one hundred eleven".