126421246543 has 2 divisors, whose sum is σ = 126421246544. Its totient is φ = 126421246542.

The previous prime is 126421246531. The next prime is 126421246591. The reversal of 126421246543 is 345642124621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126421246543 - 2²⁵ = 126387692111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 126421246496 and 126421246505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126421247543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63210623271 + 63210623272.

It is an arithmetic number, because the mean of its divisors is an integer number (63210623272).

Almost surely, 2^126421246543 is an apocalyptic number.

126421246543 is a deficient number, since it is larger than the sum of its proper divisors (1).

126421246543 is an equidigital number, since it uses as much as digits as its factorization.

126421246543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 40.

The spelling of 126421246543 in words is "one hundred twenty-six billion, four hundred twenty-one million, two hundred forty-six thousand, five hundred forty-three".