127921017 has 12 divisors (see below), whose sum is σ = 198408336. Its totient is φ = 73097640.

The previous prime is 127920997. The next prime is 127921019. The reversal of 127921017 is 710129721.

It is a happy number.

It is not a de Polignac number, because 127921017 - 2¹¹ = 127918969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (127921019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 434959 + ... + 435252.

It is an arithmetic number, because the mean of its divisors is an integer number (16534028).

Almost surely, 2^127921017 is an apocalyptic number.

It is an amenable number.

127921017 is a deficient number, since it is larger than the sum of its proper divisors (70487319).

127921017 is an equidigital number, since it uses as much as digits as its factorization.

127921017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870228 (or 870221 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 30.

The square root of 127921017 is about 11310.2173719164. The cubic root of 127921017 is about 503.8647399376.

The spelling of 127921017 in words is "one hundred twenty-seven million, nine hundred twenty-one thousand, seventeen".