21003000052 has 6 divisors (see below), whose sum is σ = 36755250098. Its totient is φ = 10501500024.

The previous prime is 21003000037. The next prime is 21003000059. The reversal of 21003000052 is 25000030012.

It can be written as a sum of positive squares in only one way, i.e., 20875626256 + 127373796 = 144484^2 + 11286^2 .

It is a super-2 number, since 2×21003000052² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002999996 and 21003000041.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003000059) by changing a digit.

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 as a sum of consecutive naturals, namely, 2625375003 + ... + 2625375010.

Almost surely, 2^21003000052 is an apocalyptic number.

It is an amenable number.

21003000052 is a deficient number, since it is larger than the sum of its proper divisors (15752250046).

21003000052 is a wasteful number, since it uses less digits than its factorization.

21003000052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250750017 (or 5250750015 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

Adding to 21003000052 its reverse (25000030012), we get a palindrome (46003030064).

The spelling of 21003000052 in words is "twenty-one billion, three million, fifty-two", and thus it is an aban number and an uban number.