126863021 has 2 divisors, whose sum is σ = 126863022. Its totient is φ = 126863020.

The previous prime is 126862933. The next prime is 126863041. The reversal of 126863021 is 120368621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126810121 + 52900 = 11261^2 + 230^2 .

It is an emirp because it is prime and its reverse (120368621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126863021 - 2²² = 122668717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126863041) 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, 63431510 + 63431511.

It is an arithmetic number, because the mean of its divisors is an integer number (63431511).

Almost surely, 2^126863021 is an apocalyptic number.

It is an amenable number.

126863021 is a deficient number, since it is larger than the sum of its proper divisors (1).

126863021 is an equidigital number, since it uses as much as digits as its factorization.

126863021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 126863021 is about 11263.3485695862. The cubic root of 126863021 is about 502.4717883884.

The spelling of 126863021 in words is "one hundred twenty-six million, eight hundred sixty-three thousand, twenty-one".