127056721 has 4 divisors (see below), whose sum is σ = 138607344. Its totient is φ = 115506100.

The previous prime is 127056689. The next prime is 127056733. The reversal of 127056721 is 127650721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 127056721 - 2⁵ = 127056689 is a prime.

It is a super-2 number, since 2×127056721² = 32286820702543682, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127056121) 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, 5775295 + ... + 5775316.

It is an arithmetic number, because the mean of its divisors is an integer number (34651836).

Almost surely, 2^127056721 is an apocalyptic number.

127056721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

127056721 is a deficient number, since it is larger than the sum of its proper divisors (11550623).

127056721 is a wasteful number, since it uses less digits than its factorization.

127056721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11550622.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 127056721 is about 11271.9439760850. The cubic root of 127056721 is about 502.7273903001.

The spelling of 127056721 in words is "one hundred twenty-seven million, fifty-six thousand, seven hundred twenty-one".