21444311142 has 48 divisors (see below), whose sum is σ = 50278475520. Its totient is φ = 6837313032.

The previous prime is 21444311131. The next prime is 21444311167. The reversal of 21444311142 is 24111344412.

21444311142 is a `hidden beast` number, since 214 + 4 + 431 + 1 + 14 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 948042 + ... + 970397.

It is an arithmetic number, because the mean of its divisors is an integer number (1047468240).

Almost surely, 2^21444311142 is an apocalyptic number.

21444311142 is an abundant number, since it is smaller than the sum of its proper divisors (28834164378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21444311142 is a wasteful number, since it uses less digits than its factorization.

21444311142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918479 (or 1918467 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

Adding to 21444311142 its reverse (24111344412), we get a palindrome (45555655554).

The spelling of 21444311142 in words is "twenty-one billion, four hundred forty-four million, three hundred eleven thousand, one hundred forty-two".