21616260402530 has 16 divisors (see below), whose sum is σ = 38910427722360. Its totient is φ = 8646246605952.

The previous prime is 21616260402439. The next prime is 21616260402577. The reversal of 21616260402530 is 3520406261612.

It can be written as a sum of positive squares in 4 ways, for example, as 21573711852001 + 42548550529 = 4644751^2 + 206273^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31841699 + ... + 32513478.

Almost surely, 2^{21616260402530} is an apocalyptic number.

21616260402530 is a deficient number, since it is larger than the sum of its proper divisors (17294167319830).

21616260402530 is a wasteful number, since it uses less digits than its factorization.

21616260402530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64388773.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 21616260402530 in words is "twenty-one trillion, six hundred sixteen billion, two hundred sixty million, four hundred two thousand, five hundred thirty".