21843833779 has 2 divisors, whose sum is σ = 21843833780. Its totient is φ = 21843833778.

The previous prime is 21843833741. The next prime is 21843833839. The reversal of 21843833779 is 97733834812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21843833779 - 2¹³ = 21843825587 is a prime.

It is not a weakly prime, because it can be changed into another prime (21843833279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10921916889 + 10921916890.

It is an arithmetic number, because the mean of its divisors is an integer number (10921916890).

Almost surely, 2^21843833779 is an apocalyptic number.

21843833779 is a deficient number, since it is larger than the sum of its proper divisors (1).

21843833779 is an equidigital number, since it uses as much as digits as its factorization.

21843833779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 55.

The spelling of 21843833779 in words is "twenty-one billion, eight hundred forty-three million, eight hundred thirty-three thousand, seven hundred seventy-nine".