20127121623155 has 8 divisors (see below), whose sum is σ = 25202656641312. Its totient is φ = 15401623502848.

The previous prime is 20127121623151. The next prime is 20127121623173. The reversal of 20127121623155 is 55132612172102.

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

It is a cyclic number.

It is not a de Polignac number, because 20127121623155 - 2² = 20127121623151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20127121623151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87509224334 + ... + 87509224563.

It is an arithmetic number, because the mean of its divisors is an integer number (3150332080164).

Almost surely, 2^{20127121623155} is an apocalyptic number.

20127121623155 is a deficient number, since it is larger than the sum of its proper divisors (5075535018157).

20127121623155 is a wasteful number, since it uses less digits than its factorization.

20127121623155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175018448925.

The product of its (nonzero) digits is 50400, while the sum is 38.

Adding to 20127121623155 its reverse (55132612172102), we get a palindrome (75259733795257).

The spelling of 20127121623155 in words is "twenty trillion, one hundred twenty-seven billion, one hundred twenty-one million, six hundred twenty-three thousand, one hundred fifty-five".