21266082843 has 4 divisors (see below), whose sum is σ = 28354777128. Its totient is φ = 14177388560.

The previous prime is 21266082791. The next prime is 21266082847. The reversal of 21266082843 is 34828066212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21266082843 - 2⁸ = 21266082587 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21266082795 and 21266082804.

It is not an unprimeable number, because it can be changed into a prime (21266082847) 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 in 3 ways as a sum of consecutive naturals, for example, 3544347138 + ... + 3544347143.

It is an arithmetic number, because the mean of its divisors is an integer number (7088694282).

Almost surely, 2^21266082843 is an apocalyptic number.

21266082843 is a deficient number, since it is larger than the sum of its proper divisors (7088694285).

21266082843 is an equidigital number, since it uses as much as digits as its factorization.

21266082843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7088694284.

The product of its (nonzero) digits is 221184, while the sum is 42.

The spelling of 21266082843 in words is "twenty-one billion, two hundred sixty-six million, eighty-two thousand, eight hundred forty-three".