21004051052 has 12 divisors (see below), whose sum is σ = 36758139936. Its totient is φ = 10501725360.

The previous prime is 21004051051. The next prime is 21004051069. The reversal of 21004051052 is 25015040012.

It is not an unprimeable number, because it can be changed into a prime (21004051051) 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 in 3 ways as a sum of consecutive naturals, for example, 174893 + ... + 269435.

It is an arithmetic number, because the mean of its divisors is an integer number (3063178328).

Almost surely, 2^21004051052 is an apocalyptic number.

It is an amenable number.

21004051052 is a deficient number, since it is larger than the sum of its proper divisors (15754088884).

21004051052 is a wasteful number, since it uses less digits than its factorization.

21004051052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150088 (or 150086 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 21004051052 its reverse (25015040012), we get a palindrome (46019091064).

The spelling of 21004051052 in words is "twenty-one billion, four million, fifty-one thousand, fifty-two".