21636316305438 has 8 divisors (see below), whose sum is σ = 43272632610888. Its totient is φ = 7212105435144.

The previous prime is 21636316305427. The next prime is 21636316305449. The reversal of 21636316305438 is 83450361363612.

It is an interprime number because it is at equal distance from previous prime (21636316305427) and next prime (21636316305449).

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

21636316305438 is an admirable number.

It is a super-2 number, since 2×21636316305438² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 1803026358781 + ... + 1803026358792.

It is an arithmetic number, because the mean of its divisors is an integer number (5409079076361).

Almost surely, 2^{21636316305438} is an apocalyptic number.

21636316305438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21636316305438 is a wasteful number, since it uses less digits than its factorization.

21636316305438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3606052717578.

The product of its (nonzero) digits is 5598720, while the sum is 51.

The spelling of 21636316305438 in words is "twenty-one trillion, six hundred thirty-six billion, three hundred sixteen million, three hundred five thousand, four hundred thirty-eight".