21170607161 has 16 divisors (see below), whose sum is σ = 24479143488. Its totient is φ = 18095078400.

The previous prime is 21170607121. The next prime is 21170607191. The reversal of 21170607161 is 16170607112.

It is a cyclic number.

It is not a de Polignac number, because 21170607161 - 2⁶ = 21170607097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21170607121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123281 + ... + 239873.

It is an arithmetic number, because the mean of its divisors is an integer number (1529946468).

Almost surely, 2^21170607161 is an apocalyptic number.

It is an amenable number.

21170607161 is a deficient number, since it is larger than the sum of its proper divisors (3308536327).

21170607161 is a wasteful number, since it uses less digits than its factorization.

21170607161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117592.

The product of its (nonzero) digits is 3528, while the sum is 32.

The spelling of 21170607161 in words is "twenty-one billion, one hundred seventy million, six hundred seven thousand, one hundred sixty-one".