21044113040 has 20 divisors (see below), whose sum is σ = 48927563004. Its totient is φ = 8417645184.

The previous prime is 21044113039. The next prime is 21044113099. The reversal of 21044113040 is 4031144012.

It can be written as a sum of positive squares in 2 ways, for example, as 16660613776 + 4383499264 = 129076^2 + 66208^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

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 3 ways as a sum of consecutive naturals, for example, 131525627 + ... + 131525786.

Almost surely, 2^21044113040 is an apocalyptic number.

21044113040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21044113040 is an abundant number, since it is smaller than the sum of its proper divisors (27883449964).

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

21044113040 is a wasteful number, since it uses less digits than its factorization.

21044113040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263051426 (or 263051420 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21044113040 its reverse (4031144012), we get a palindrome (25075257052).

The spelling of 21044113040 in words is "twenty-one billion, forty-four million, one hundred thirteen thousand, forty".