21703618360187 has 2 divisors, whose sum is σ = 21703618360188. Its totient is φ = 21703618360186.

The previous prime is 21703618360181. The next prime is 21703618360189. The reversal of 21703618360187 is 78106381630712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21703618360187 - 2¹⁶ = 21703618294651 is a prime.

Together with 21703618360189, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21703618360181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10851809180093 + 10851809180094.

It is an arithmetic number, because the mean of its divisors is an integer number (10851809180094).

Almost surely, 2^{21703618360187} is an apocalyptic number.

21703618360187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21703618360187 is an equidigital number, since it uses as much as digits as its factorization.

21703618360187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 53.

Adding to 21703618360187 its reverse (78106381630712), we get a palindrome (99809999990899).

The spelling of 21703618360187 in words is "twenty-one trillion, seven hundred three billion, six hundred eighteen million, three hundred sixty thousand, one hundred eighty-seven".