21061343605343 has 2 divisors, whose sum is σ = 21061343605344. Its totient is φ = 21061343605342.

The previous prime is 21061343605283. The next prime is 21061343605349. The reversal of 21061343605343 is 34350634316012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21061343605343 - 2¹⁰ = 21061343604319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21061343605343.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21061343605349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10530671802671 + 10530671802672.

It is an arithmetic number, because the mean of its divisors is an integer number (10530671802672).

Almost surely, 2^{21061343605343} is an apocalyptic number.

21061343605343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21061343605343 is an equidigital number, since it uses as much as digits as its factorization.

21061343605343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 41.

The spelling of 21061343605343 in words is "twenty-one trillion, sixty-one billion, three hundred forty-three million, six hundred five thousand, three hundred forty-three".