127512421 has 2 divisors, whose sum is σ = 127512422. Its totient is φ = 127512420.

The previous prime is 127512389. The next prime is 127512431. The reversal of 127512421 is 124215721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82555396 + 44957025 = 9086^2 + 6705^2 .

It is a cyclic number.

It is not a de Polignac number, because 127512421 - 2⁵ = 127512389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127512431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63756210 + 63756211.

It is an arithmetic number, because the mean of its divisors is an integer number (63756211).

Almost surely, 2^127512421 is an apocalyptic number.

It is an amenable number.

127512421 is a deficient number, since it is larger than the sum of its proper divisors (1).

127512421 is an equidigital number, since it uses as much as digits as its factorization.

127512421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 25.

The square root of 127512421 is about 11292.1397883661. The cubic root of 127512421 is about 503.3276983809.

The spelling of 127512421 in words is "one hundred twenty-seven million, five hundred twelve thousand, four hundred twenty-one".