21500163325327 has 4 divisors (see below), whose sum is σ = 22024557552816. Its totient is φ = 20975769097840.

The previous prime is 21500163325307. The next prime is 21500163325351. The reversal of 21500163325327 is 72352336100512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21500163325327 - 2¹¹ = 21500163323279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21500163325327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500163325307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262197113683 + ... + 262197113764.

It is an arithmetic number, because the mean of its divisors is an integer number (5506139388204).

Almost surely, 2^{21500163325327} is an apocalyptic number.

21500163325327 is a deficient number, since it is larger than the sum of its proper divisors (524394227489).

21500163325327 is an equidigital number, since it uses as much as digits as its factorization.

21500163325327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524394227488.

The product of its (nonzero) digits is 226800, while the sum is 40.

Adding to 21500163325327 its reverse (72352336100512), we get a palindrome (93852499425839).

The spelling of 21500163325327 in words is "twenty-one trillion, five hundred billion, one hundred sixty-three million, three hundred twenty-five thousand, three hundred twenty-seven".