20555321124187 has 2 divisors, whose sum is σ = 20555321124188. Its totient is φ = 20555321124186.

The previous prime is 20555321124181. The next prime is 20555321124209. The reversal of 20555321124187 is 78142112355502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20555321124187 - 2³ = 20555321124179 is a prime.

It is not a weakly prime, because it can be changed into another prime (20555321124181) 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 as a sum of consecutive naturals, namely, 10277660562093 + 10277660562094.

It is an arithmetic number, because the mean of its divisors is an integer number (10277660562094).

Almost surely, 2^{20555321124187} is an apocalyptic number.

20555321124187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20555321124187 is an equidigital number, since it uses as much as digits as its factorization.

20555321124187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672000, while the sum is 46.

Adding to 20555321124187 its reverse (78142112355502), we get a palindrome (98697433479689).

The spelling of 20555321124187 in words is "twenty trillion, five hundred fifty-five billion, three hundred twenty-one million, one hundred twenty-four thousand, one hundred eighty-seven".