127620421 has 2 divisors, whose sum is σ = 127620422. Its totient is φ = 127620420.

The previous prime is 127620419. The next prime is 127620457. The reversal of 127620421 is 124026721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113848900 + 13771521 = 10670^2 + 3711^2 .

It is a cyclic number.

It is not a de Polignac number, because 127620421 - 2¹ = 127620419 is a prime.

Together with 127620419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127620401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63810210 + 63810211.

It is an arithmetic number, because the mean of its divisors is an integer number (63810211).

Almost surely, 2^127620421 is an apocalyptic number.

It is an amenable number.

127620421 is a deficient number, since it is larger than the sum of its proper divisors (1).

127620421 is an equidigital number, since it uses as much as digits as its factorization.

127620421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 127620421 is about 11296.9208636690. The cubic root of 127620421 is about 503.4697604932.

The spelling of 127620421 in words is "one hundred twenty-seven million, six hundred twenty thousand, four hundred twenty-one".