21616041315623 has 16 divisors (see below), whose sum is σ = 22211240889600. Its totient is φ = 21028893926400.

The previous prime is 21616041315587. The next prime is 21616041315637. The reversal of 21616041315623 is 32651314061612.

It is a cyclic number.

It is not a de Polignac number, because 21616041315623 - 2¹⁸ = 21616041053479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616041315643) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7986218 + ... + 10344648.

It is an arithmetic number, because the mean of its divisors is an integer number (1388202555600).

Almost surely, 2^{21616041315623} is an apocalyptic number.

21616041315623 is a deficient number, since it is larger than the sum of its proper divisors (595199573977).

21616041315623 is a wasteful number, since it uses less digits than its factorization.

21616041315623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360138.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 21616041315623 in words is "twenty-one trillion, six hundred sixteen billion, forty-one million, three hundred fifteen thousand, six hundred twenty-three".