127396021 has 2 divisors, whose sum is σ = 127396022. Its totient is φ = 127396020.

The previous prime is 127396013. The next prime is 127396033. The reversal of 127396021 is 120693721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124880625 + 2515396 = 11175^2 + 1586^2 .

It is a cyclic number.

It is not a de Polignac number, because 127396021 - 2³ = 127396013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127396421) 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, 63698010 + 63698011.

It is an arithmetic number, because the mean of its divisors is an integer number (63698011).

Almost surely, 2^127396021 is an apocalyptic number.

It is an amenable number.

127396021 is a deficient number, since it is larger than the sum of its proper divisors (1).

127396021 is an equidigital number, since it uses as much as digits as its factorization.

127396021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 127396021 is about 11286.9845840242. The cubic root of 127396021 is about 503.1744971480.

The spelling of 127396021 in words is "one hundred twenty-seven million, three hundred ninety-six thousand, twenty-one".