21706822343 has 2 divisors, whose sum is σ = 21706822344. Its totient is φ = 21706822342.

The previous prime is 21706822339. The next prime is 21706822369. The reversal of 21706822343 is 34322860712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21706822343 - 2² = 21706822339 is a prime.

It is a super-2 number, since 2×21706822343² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21706822297 and 21706822306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21706822373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10853411171 + 10853411172.

It is an arithmetic number, because the mean of its divisors is an integer number (10853411172).

Almost surely, 2^21706822343 is an apocalyptic number.

21706822343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21706822343 is an equidigital number, since it uses as much as digits as its factorization.

21706822343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 21706822343 in words is "twenty-one billion, seven hundred six million, eight hundred twenty-two thousand, three hundred forty-three".