21071223343463 has 2 divisors, whose sum is σ = 21071223343464. Its totient is φ = 21071223343462.

The previous prime is 21071223343459. The next prime is 21071223343501. The reversal of 21071223343463 is 36434332217012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21071223343463 - 2² = 21071223343459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21071223343463.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21071223343363) 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, 10535611671731 + 10535611671732.

It is an arithmetic number, because the mean of its divisors is an integer number (10535611671732).

Almost surely, 2^{21071223343463} is an apocalyptic number.

21071223343463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21071223343463 is an equidigital number, since it uses as much as digits as its factorization.

21071223343463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 41.

The spelling of 21071223343463 in words is "twenty-one trillion, seventy-one billion, two hundred twenty-three million, three hundred forty-three thousand, four hundred sixty-three".