127123621 has 2 divisors, whose sum is σ = 127123622. Its totient is φ = 127123620.

The previous prime is 127123567. The next prime is 127123649. The reversal of 127123621 is 126321721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105165025 + 21958596 = 10255^2 + 4686^2 .

It is an emirp because it is prime and its reverse (126321721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127123621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127123681) 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 as a sum of consecutive naturals, namely, 63561810 + 63561811.

It is an arithmetic number, because the mean of its divisors is an integer number (63561811).

Almost surely, 2^127123621 is an apocalyptic number.

It is an amenable number.

127123621 is a deficient number, since it is larger than the sum of its proper divisors (1).

127123621 is an equidigital number, since it uses as much as digits as its factorization.

127123621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 127123621 is about 11274.9111304702. The cubic root of 127123621 is about 502.8156095904.

The spelling of 127123621 in words is "one hundred twenty-seven million, one hundred twenty-three thousand, six hundred twenty-one".