21444111143 has 16 divisors (see below), whose sum is σ = 26408106816. Its totient is φ = 16956898560.

The previous prime is 21444111133. The next prime is 21444111179. The reversal of 21444111143 is 34111144412.

It is a happy number.

It is not a de Polignac number, because 21444111143 - 2¹⁸ = 21443848999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444111133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90755 + ... + 226107.

It is an arithmetic number, because the mean of its divisors is an integer number (1650506676).

Almost surely, 2^21444111143 is an apocalyptic number.

21444111143 is a deficient number, since it is larger than the sum of its proper divisors (4963995673).

21444111143 is a wasteful number, since it uses less digits than its factorization.

21444111143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137114.

The product of its digits is 1536, while the sum is 26.

Adding to 21444111143 its reverse (34111144412), we get a palindrome (55555255555).

The spelling of 21444111143 in words is "twenty-one billion, four hundred forty-four million, one hundred eleven thousand, one hundred forty-three".