21165160015205 has 16 divisors (see below), whose sum is σ = 26571227364864. Its totient is φ = 16167678011520.

The previous prime is 21165160015177. The next prime is 21165160015229. The reversal of 21165160015205 is 50251006156112.

It is not a de Polignac number, because 21165160015205 - 2²² = 21165155820901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1098338057 + ... + 1098357326.

It is an arithmetic number, because the mean of its divisors is an integer number (1660701710304).

Almost surely, 2^{21165160015205} is an apocalyptic number.

It is an amenable number.

21165160015205 is a deficient number, since it is larger than the sum of its proper divisors (5406067349659).

21165160015205 is a wasteful number, since it uses less digits than its factorization.

21165160015205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196695476.

The product of its (nonzero) digits is 18000, while the sum is 35.

The spelling of 21165160015205 in words is "twenty-one trillion, one hundred sixty-five billion, one hundred sixty million, fifteen thousand, two hundred five".