127449220421 has 2 divisors, whose sum is σ = 127449220422. Its totient is φ = 127449220420.

The previous prime is 127449220397. The next prime is 127449220477. The reversal of 127449220421 is 124022944721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116765724100 + 10683496321 = 341710^2 + 103361^2 .

It is a cyclic number.

It is not a de Polignac number, because 127449220421 - 2¹⁴ = 127449204037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127449220321) 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, 63724610210 + 63724610211.

It is an arithmetic number, because the mean of its divisors is an integer number (63724610211).

Almost surely, 2^127449220421 is an apocalyptic number.

It is an amenable number.

127449220421 is a deficient number, since it is larger than the sum of its proper divisors (1).

127449220421 is an equidigital number, since it uses as much as digits as its factorization.

127449220421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 38.

The spelling of 127449220421 in words is "one hundred twenty-seven billion, four hundred forty-nine million, two hundred twenty thousand, four hundred twenty-one".