127055721 has 24 divisors (see below), whose sum is σ = 184938336. Its totient is φ = 77550720.

The previous prime is 127055713. The next prime is 127055737. The reversal of 127055721 is 127550721.

It is not a de Polignac number, because 127055721 - 2³ = 127055713 is a prime.

It is a super-2 number, since 2×127055721² = 32286312477659682, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127055791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65461 + ... + 67373.

It is an arithmetic number, because the mean of its divisors is an integer number (7705764).

Almost surely, 2^127055721 is an apocalyptic number.

It is an amenable number.

127055721 is a deficient number, since it is larger than the sum of its proper divisors (57882615).

127055721 is a wasteful number, since it uses less digits than its factorization.

127055721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073 (or 2060 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 30.

The square root of 127055721 is about 11271.8996180768. The cubic root of 127055721 is about 502.7260713913.

The spelling of 127055721 in words is "one hundred twenty-seven million, fifty-five thousand, seven hundred twenty-one".