21216362531330 has 16 divisors (see below), whose sum is σ = 38189840490360. Its totient is φ = 8486458804992.

The previous prime is 21216362531327. The next prime is 21216362531381. The reversal of 21216362531330 is 3313526361212.

It can be written as a sum of positive squares in 4 ways, for example, as 14472249586081 + 6744112945249 = 3804241^2 + 2596943^2 .

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 7 ways as a sum of consecutive naturals, for example, 9737525 + ... + 11715464.

Almost surely, 2^{21216362531330} is an apocalyptic number.

21216362531330 is a deficient number, since it is larger than the sum of its proper divisors (16973477959030).

21216362531330 is a wasteful number, since it uses less digits than its factorization.

21216362531330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21551893.

The product of its (nonzero) digits is 116640, while the sum is 38.

Adding to 21216362531330 its reverse (3313526361212), we get a palindrome (24529888892542).

The spelling of 21216362531330 in words is "twenty-one trillion, two hundred sixteen billion, three hundred sixty-two million, five hundred thirty-one thousand, three hundred thirty".