21812429520643 has 2 divisors, whose sum is σ = 21812429520644. Its totient is φ = 21812429520642.

The previous prime is 21812429520601. The next prime is 21812429520683. The reversal of 21812429520643 is 34602592421812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21812429520643 - 2¹⁷ = 21812429389571 is a prime.

It is not a weakly prime, because it can be changed into another prime (21812429520683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10906214760321 + 10906214760322.

It is an arithmetic number, because the mean of its divisors is an integer number (10906214760322).

Almost surely, 2^{21812429520643} is an apocalyptic number.

21812429520643 is a deficient number, since it is larger than the sum of its proper divisors (1).

21812429520643 is an equidigital number, since it uses as much as digits as its factorization.

21812429520643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 21812429520643 in words is "twenty-one trillion, eight hundred twelve billion, four hundred twenty-nine million, five hundred twenty thousand, six hundred forty-three".