127616021 has 8 divisors (see below), whose sum is σ = 137947320. Its totient is φ = 117358272.

The previous prime is 127616003. The next prime is 127616023. The reversal of 127616021 is 120616721.

It can be written as a sum of positive squares in 4 ways, for example, as 16313521 + 111302500 = 4039^2 + 10550^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 127616021 - 2¹⁰ = 127614997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127616023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14750 + ... + 21743.

It is an arithmetic number, because the mean of its divisors is an integer number (17243415).

Almost surely, 2^127616021 is an apocalyptic number.

It is an amenable number.

127616021 is a deficient number, since it is larger than the sum of its proper divisors (10331299).

127616021 is a wasteful number, since it uses less digits than its factorization.

127616021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36775.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 127616021 is about 11296.7261186593. The cubic root of 127616021 is about 503.4639743440.

The spelling of 127616021 in words is "one hundred twenty-seven million, six hundred sixteen thousand, twenty-one".