21500225526117 has 16 divisors (see below), whose sum is σ = 32214384736128. Its totient is φ = 12655651145280.

The previous prime is 21500225526079. The next prime is 21500225526167. The reversal of 21500225526117 is 71162552200512.

It is not a de Polignac number, because 21500225526117 - 2³⁰ = 21499151784293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500225526167) 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, 11984517234 + ... + 11984519027.

It is an arithmetic number, because the mean of its divisors is an integer number (2013399046008).

Almost surely, 2^{21500225526117} is an apocalyptic number.

It is an amenable number.

21500225526117 is a deficient number, since it is larger than the sum of its proper divisors (10714159210011).

21500225526117 is a wasteful number, since it uses less digits than its factorization.

21500225526117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23969036300.

The product of its (nonzero) digits is 84000, while the sum is 39.

Adding to 21500225526117 its reverse (71162552200512), we get a palindrome (92662777726629).

The spelling of 21500225526117 in words is "twenty-one trillion, five hundred billion, two hundred twenty-five million, five hundred twenty-six thousand, one hundred seventeen".