21440144011 has 8 divisors (see below), whose sum is σ = 25188421104. Its totient is φ = 17991729120.

The previous prime is 21440144009. The next prime is 21440144051. The reversal of 21440144011 is 11044104412.

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

It is a cyclic number.

It is not a de Polignac number, because 21440144011 - 2¹ = 21440144009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21440144051) 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, 74965396 + ... + 74965681.

It is an arithmetic number, because the mean of its divisors is an integer number (3148552638).

Almost surely, 2^21440144011 is an apocalyptic number.

21440144011 is a deficient number, since it is larger than the sum of its proper divisors (3748277093).

21440144011 is a wasteful number, since it uses less digits than its factorization.

21440144011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149931101.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21440144011 its reverse (11044104412), we get a palindrome (32484248423).

The spelling of 21440144011 in words is "twenty-one billion, four hundred forty million, one hundred forty-four thousand, eleven".