21115500065010 has 96 divisors (see below), whose sum is σ = 60381345024000. Its totient is φ = 5087072997504.

The previous prime is 21115500064943. The next prime is 21115500065041. The reversal of 21115500065010 is 1056000551112.

21115500065010 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 5 + 5 + 0 + 0 + 0 + 650 + 1 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 191939010 + ... + 192048989.

It is an arithmetic number, because the mean of its divisors is an integer number (628972344000).

Almost surely, 2^{21115500065010} is an apocalyptic number.

21115500065010 is an abundant number, since it is smaller than the sum of its proper divisors (39265844958990).

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

21115500065010 is a wasteful number, since it uses less digits than its factorization.

21115500065010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383988072 (or 383988069 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

It can be divided in two parts, 21115 and 500065010, that added together give a triangular number (500086125 = T₃₁₆₂₅).

The spelling of 21115500065010 in words is "twenty-one trillion, one hundred fifteen billion, five hundred million, sixty-five thousand, ten".