21115500065009 has 8 divisors (see below), whose sum is σ = 24166425187008. Its totient is φ = 18073181221200.

The previous prime is 21115500064943. The next prime is 21115500065041. The reversal of 21115500065009 is 90056000551112.

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

It is not a de Polignac number, because 21115500065009 - 2¹² = 21115500060913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21115500065009.

It is not an unprimeable number, because it can be changed into a prime (21115500365009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2151564287 + ... + 2151574100.

It is an arithmetic number, because the mean of its divisors is an integer number (3020803148376).

Almost surely, 2^{21115500065009} is an apocalyptic number.

It is an amenable number.

21115500065009 is a deficient number, since it is larger than the sum of its proper divisors (3050925121999).

21115500065009 is an equidigital number, since it uses as much as digits as its factorization.

21115500065009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4303139095.

The product of its (nonzero) digits is 13500, while the sum is 35.

The spelling of 21115500065009 in words is "twenty-one trillion, one hundred fifteen billion, five hundred million, sixty-five thousand, nine".