20127121646575 has 144 divisors (see below), whose sum is σ = 27029267516160. Its totient is φ = 14861722613760.

The previous prime is 20127121646573. The next prime is 20127121646609. The reversal of 20127121646575 is 57564612172102.

It is not a de Polignac number, because 20127121646575 - 2¹ = 20127121646573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20127121646573) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 27235617556 + ... + 27235618294.

It is an arithmetic number, because the mean of its divisors is an integer number (187703246640).

Almost surely, 2^{20127121646575} is an apocalyptic number.

20127121646575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20127121646575 is a deficient number, since it is larger than the sum of its proper divisors (6902145869585).

20127121646575 is a wasteful number, since it uses less digits than its factorization.

20127121646575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326 (or 1302 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 20127121646575 in words is "twenty trillion, one hundred twenty-seven billion, one hundred twenty-one million, six hundred forty-six thousand, five hundred seventy-five".