21044440142 has 16 divisors (see below), whose sum is σ = 35000889264. Its totient is φ = 9408840000.

The previous prime is 21044440133. The next prime is 21044440171. The reversal of 21044440142 is 24104444012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7839359 + ... + 7842042.

It is an arithmetic number, because the mean of its divisors is an integer number (2187555579).

Almost surely, 2^21044440142 is an apocalyptic number.

21044440142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21044440142 is a deficient number, since it is larger than the sum of its proper divisors (13956449122).

21044440142 is a wasteful number, since it uses less digits than its factorization.

21044440142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15681475.

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 21044440142 its reverse (24104444012), we get a palindrome (45148884154).

The spelling of 21044440142 in words is "twenty-one billion, forty-four million, four hundred forty thousand, one hundred forty-two".