21426646751743 has 2 divisors, whose sum is σ = 21426646751744. Its totient is φ = 21426646751742.

The previous prime is 21426646751689. The next prime is 21426646751813. The reversal of 21426646751743 is 34715764662412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21426646751743 - 2¹⁷ = 21426646620671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21426646755743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10713323375871 + 10713323375872.

It is an arithmetic number, because the mean of its divisors is an integer number (10713323375872).

Almost surely, 2^{21426646751743} is an apocalyptic number.

21426646751743 is a deficient number, since it is larger than the sum of its proper divisors (1).

21426646751743 is an equidigital number, since it uses as much as digits as its factorization.

21426646751743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40642560, while the sum is 58.

The spelling of 21426646751743 in words is "twenty-one trillion, four hundred twenty-six billion, six hundred forty-six million, seven hundred fifty-one thousand, seven hundred forty-three".