21067878343 has 2 divisors, whose sum is σ = 21067878344. Its totient is φ = 21067878342.

The previous prime is 21067878341. The next prime is 21067878361. The reversal of 21067878343 is 34387876012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21067878343 - 2¹ = 21067878341 is a prime.

It is a super-3 number, since 3×21067878343³ (a number of 32 digits) contains 333 as substring.

Together with 21067878341, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21067878341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10533939171 + 10533939172.

It is an arithmetic number, because the mean of its divisors is an integer number (10533939172).

Almost surely, 2^21067878343 is an apocalyptic number.

21067878343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21067878343 is an equidigital number, since it uses as much as digits as its factorization.

21067878343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 49.

The spelling of 21067878343 in words is "twenty-one billion, sixty-seven million, eight hundred seventy-eight thousand, three hundred forty-three".