20121271168 has 32 divisors (see below), whose sum is σ = 42195105000. Its totient is φ = 9531127296.

The previous prime is 20121271129. The next prime is 20121271169. The reversal of 20121271168 is 86117212102.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121271169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4134343 + ... + 4139206.

Almost surely, 2^20121271168 is an apocalyptic number.

It is an amenable number.

20121271168 is an abundant number, since it is smaller than the sum of its proper divisors (22073833832).

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

20121271168 is an equidigital number, since it uses as much as digits as its factorization.

20121271168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8273582 (or 8273570 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 31.

The spelling of 20121271168 in words is "twenty billion, one hundred twenty-one million, two hundred seventy-one thousand, one hundred sixty-eight".