21006318050 has 12 divisors (see below), whose sum is σ = 39071751666. Its totient is φ = 8402527200.

The previous prime is 21006318049. The next prime is 21006318079. The reversal of 21006318050 is 5081360012.

It can be written as a sum of positive squares in 3 ways, for example, as 9484227769 + 11522090281 = 97387^2 + 107341^2 .

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 5 ways as a sum of consecutive naturals, for example, 210063131 + ... + 210063230.

Almost surely, 2^21006318050 is an apocalyptic number.

21006318050 is a deficient number, since it is larger than the sum of its proper divisors (18065433616).

21006318050 is a wasteful number, since it uses less digits than its factorization.

21006318050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420126373 (or 420126368 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 21006318050 its reverse (5081360012), we get a palindrome (26087678062).

The spelling of 21006318050 in words is "twenty-one billion, six million, three hundred eighteen thousand, fifty".