21144043030044 has 48 divisors (see below), whose sum is σ = 54376058209536. Its totient is φ = 6341231270400.

The previous prime is 21144043030013. The next prime is 21144043030063. The reversal of 21144043030044 is 44003034044112.

It is a junction number, because it is equal to n+sod(n) for n = 21144043029993 and 21144043030020.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 825668352 + ... + 825693959.

It is an arithmetic number, because the mean of its divisors is an integer number (1132834546032).

Almost surely, 2^{21144043030044} is an apocalyptic number.

It is an amenable number.

21144043030044 is an abundant number, since it is smaller than the sum of its proper divisors (33232015179492).

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

21144043030044 is a wasteful number, since it uses less digits than its factorization.

21144043030044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651362426 (or 1651362424 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 21144043030044 its reverse (44003034044112), we get a palindrome (65147077074156).

The spelling of 21144043030044 in words is "twenty-one trillion, one hundred forty-four billion, forty-three million, thirty thousand, forty-four".