21500163252047 has 8 divisors (see below), whose sum is σ = 21740319419520. Its totient is φ = 21260611252440.

The previous prime is 21500163252041. The next prime is 21500163252091. The reversal of 21500163252047 is 74025236100512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21500163252047 - 2¹² = 21500163247951 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 21500163252047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500163252041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150970397 + ... + 151112742.

It is an arithmetic number, because the mean of its divisors is an integer number (2717539927440).

Almost surely, 2^{21500163252047} is an apocalyptic number.

21500163252047 is a deficient number, since it is larger than the sum of its proper divisors (240156167473).

21500163252047 is a wasteful number, since it uses less digits than its factorization.

21500163252047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302083933.

The product of its (nonzero) digits is 100800, while the sum is 38.

Adding to 21500163252047 its reverse (74025236100512), we get a palindrome (95525399352559).

The spelling of 21500163252047 in words is "twenty-one trillion, five hundred billion, one hundred sixty-three million, two hundred fifty-two thousand, forty-seven".