20127121623156 has 12 divisors (see below), whose sum is σ = 46963283787392. Its totient is φ = 6709040541048.

The previous prime is 20127121623151. The next prime is 20127121623173. The reversal of 20127121623156 is 65132612172102.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20127121623151) 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 in 3 ways as a sum of consecutive naturals, for example, 838630067620 + ... + 838630067643.

Almost surely, 2^{20127121623156} is an apocalyptic number.

It is an amenable number.

20127121623156 is an abundant number, since it is smaller than the sum of its proper divisors (26836162164236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20127121623156 is a wasteful number, since it uses less digits than its factorization.

20127121623156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677260135270 (or 1677260135268 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

Adding to 20127121623156 its reverse (65132612172102), we get a palindrome (85259733795258).

The spelling of 20127121623156 in words is "twenty trillion, one hundred twenty-seven billion, one hundred twenty-one million, six hundred twenty-three thousand, one hundred fifty-six".