21444120311 has 8 divisors (see below), whose sum is σ = 22421328000. Its totient is φ = 20470650552.

The previous prime is 21444120293. The next prime is 21444120337. The reversal of 21444120311 is 11302144412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21444120311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444120361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 922745 + ... + 945698.

It is an arithmetic number, because the mean of its divisors is an integer number (2802666000).

Almost surely, 2^21444120311 is an apocalyptic number.

21444120311 is a deficient number, since it is larger than the sum of its proper divisors (977207689).

21444120311 is a wasteful number, since it uses less digits than its factorization.

21444120311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868965.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21444120311 its reverse (11302144412), we get a palindrome (32746264723).

The spelling of 21444120311 in words is "twenty-one billion, four hundred forty-four million, one hundred twenty thousand, three hundred eleven".