21444311442 has 32 divisors (see below), whose sum is σ = 44620775424. Its totient is φ = 6863043600.

The previous prime is 21444311423. The next prime is 21444311453. The reversal of 21444311442 is 24411344412.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 430284 + ... + 477527.

It is an arithmetic number, because the mean of its divisors is an integer number (1394399232).

Almost surely, 2^21444311442 is an apocalyptic number.

21444311442 is an abundant number, since it is smaller than the sum of its proper divisors (23176463982).

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

21444311442 is a wasteful number, since it uses less digits than its factorization.

21444311442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907974.

The product of its digits is 12288, while the sum is 30.

Adding to 21444311442 its reverse (24411344412), we get a palindrome (45855655854).

The spelling of 21444311442 in words is "twenty-one billion, four hundred forty-four million, three hundred eleven thousand, four hundred forty-two".