21366636306323 has 32 divisors (see below), whose sum is σ = 27726571676160. Its totient is φ = 15976591061760.

The previous prime is 21366636306233. The next prime is 21366636306329. The reversal of 21366636306323 is 32360363666312.

It is not a de Polignac number, because 21366636306323 - 2¹² = 21366636302227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21366636306329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28987490 + ... + 29715447.

It is an arithmetic number, because the mean of its divisors is an integer number (866455364880).

Almost surely, 2^{21366636306323} is an apocalyptic number.

21366636306323 is a deficient number, since it is larger than the sum of its proper divisors (6359935369837).

21366636306323 is a wasteful number, since it uses less digits than its factorization.

21366636306323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58703147.

The product of its (nonzero) digits is 7558272, while the sum is 50.

The spelling of 21366636306323 in words is "twenty-one trillion, three hundred sixty-six billion, six hundred thirty-six million, three hundred six thousand, three hundred twenty-three".