21354642105266 has 8 divisors (see below), whose sum is σ = 32032078536240. Its totient is φ = 10677282593188.

The previous prime is 21354642105239. The next prime is 21354642105287. The reversal of 21354642105266 is 66250124645312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21354642105266.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 18530576 + ... + 19649211.

It is an arithmetic number, because the mean of its divisors is an integer number (4004009817030).

Almost surely, 2^{21354642105266} is an apocalyptic number.

21354642105266 is a deficient number, since it is larger than the sum of its proper divisors (10677436430974).

21354642105266 is a wasteful number, since it uses less digits than its factorization.

21354642105266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38459448.

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 21354642105266 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred forty-two million, one hundred five thousand, two hundred sixty-six".