21016586738306 has 8 divisors (see below), whose sum is σ = 31531193937804. Its totient is φ = 10506188759040.

The previous prime is 21016586738297. The next prime is 21016586738333. The reversal of 21016586738306 is 60383768561012.

It can be written as a sum of positive squares in 2 ways, for example, as 20910088290025 + 106498448281 = 4572755^2 + 326341^2 .

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

It is a super-3 number, since 3×21016586738306³ (a number of 41 digits) contains 333 as substring.

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, 1052292575 + ... + 1052312546.

Almost surely, 2^{21016586738306} is an apocalyptic number.

21016586738306 is a deficient number, since it is larger than the sum of its proper divisors (10514607199498).

21016586738306 is a wasteful number, since it uses less digits than its factorization.

21016586738306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104610116.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 21016586738306 in words is "twenty-one trillion, sixteen billion, five hundred eighty-six million, seven hundred thirty-eight thousand, three hundred six".