21830197843 has 2 divisors, whose sum is σ = 21830197844. Its totient is φ = 21830197842.

The previous prime is 21830197819. The next prime is 21830197871. The reversal of 21830197843 is 34879103812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21830197843 - 2²⁵ = 21796643411 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21830197793 and 21830197802.

It is not a weakly prime, because it can be changed into another prime (21830197243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10915098921 + 10915098922.

It is an arithmetic number, because the mean of its divisors is an integer number (10915098922).

Almost surely, 2^21830197843 is an apocalyptic number.

21830197843 is a deficient number, since it is larger than the sum of its proper divisors (1).

21830197843 is an equidigital number, since it uses as much as digits as its factorization.

21830197843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 21830197843 in words is "twenty-one billion, eight hundred thirty million, one hundred ninety-seven thousand, eight hundred forty-three".