20123550021185 has 16 divisors (see below), whose sum is σ = 26244403988880. Its totient is φ = 14724133136640.

The previous prime is 20123550021181. The next prime is 20123550021229. The reversal of 20123550021185 is 58112005532102.

It is a Cunningham number, because it is equal to 4485928²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 20123550021184 = 1^2 + 4485928^2 .

It is not a de Polignac number, because 20123550021185 - 2² = 20123550021181 is a prime.

It is a super-3 number, since 3×20123550021185³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20123550021181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1420144646 + ... + 1420158815.

It is an arithmetic number, because the mean of its divisors is an integer number (1640275249305).

Almost surely, 2^{20123550021185} is an apocalyptic number.

It is an amenable number.

20123550021185 is a deficient number, since it is larger than the sum of its proper divisors (6120853967695).

20123550021185 is a wasteful number, since it uses less digits than its factorization.

20123550021185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840303588.

The product of its (nonzero) digits is 24000, while the sum is 35.

Adding to 20123550021185 its reverse (58112005532102), we get a palindrome (78235555553287).

The spelling of 20123550021185 in words is "twenty trillion, one hundred twenty-three billion, five hundred fifty million, twenty-one thousand, one hundred eighty-five".