21044200052 has 24 divisors (see below), whose sum is σ = 38114530440. Its totient is φ = 10159626240.

The previous prime is 21044200033. The next prime is 21044200103. The reversal of 21044200052 is 25000244012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1028741476 + 20015458576 = 32074^2 + 141476^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21044199997 and 21044200033.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 645527 + ... + 677342.

It is an arithmetic number, because the mean of its divisors is an integer number (1588105435).

Almost surely, 2^21044200052 is an apocalyptic number.

It is an amenable number.

21044200052 is a deficient number, since it is larger than the sum of its proper divisors (17070330388).

21044200052 is a wasteful number, since it uses less digits than its factorization.

21044200052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323011 (or 1323009 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 21044200052 its reverse (25000244012), we get a palindrome (46044444064).

The spelling of 21044200052 in words is "twenty-one billion, forty-four million, two hundred thousand, fifty-two".