21336013823 has 2 divisors, whose sum is σ = 21336013824. Its totient is φ = 21336013822.

The previous prime is 21336013819. The next prime is 21336013849. The reversal of 21336013823 is 32831063312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21336013823 - 2² = 21336013819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21336013823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21336013873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10668006911 + 10668006912.

It is an arithmetic number, because the mean of its divisors is an integer number (10668006912).

Almost surely, 2^21336013823 is an apocalyptic number.

21336013823 is a deficient number, since it is larger than the sum of its proper divisors (1).

21336013823 is an equidigital number, since it uses as much as digits as its factorization.

21336013823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 32.

The spelling of 21336013823 in words is "twenty-one billion, three hundred thirty-six million, thirteen thousand, eight hundred twenty-three".