127841721 has 16 divisors (see below), whose sum is σ = 196297728. Its totient is φ = 72493200.

The previous prime is 127841689. The next prime is 127841723. The reversal of 127841721 is 127148721.

It is not a de Polignac number, because 127841721 - 2⁵ = 127841689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (127841723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20485 + ... + 25986.

It is an arithmetic number, because the mean of its divisors is an integer number (12268608).

Almost surely, 2^127841721 is an apocalyptic number.

It is an amenable number.

127841721 is a deficient number, since it is larger than the sum of its proper divisors (68456007).

127841721 is a wasteful number, since it uses less digits than its factorization.

127841721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46612.

The product of its digits is 6272, while the sum is 33.

The square root of 127841721 is about 11306.7113255800. The cubic root of 127841721 is about 503.7606061060.

The spelling of 127841721 in words is "one hundred twenty-seven million, eight hundred forty-one thousand, seven hundred twenty-one".