2171506505 has 64 divisors (see below), whose sum is σ = 3153185280. Its totient is φ = 1404739584.

The previous prime is 2171506501. The next prime is 2171506537. The reversal of 2171506505 is 5056051712.

It is a cyclic number.

It is not a de Polignac number, because 2171506505 - 2² = 2171506501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2171506501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7411139 + ... + 7411431.

It is an arithmetic number, because the mean of its divisors is an integer number (49268520).

Almost surely, 2^2171506505 is an apocalyptic number.

It is an amenable number.

2171506505 is a deficient number, since it is larger than the sum of its proper divisors (981678775).

2171506505 is a wasteful number, since it uses less digits than its factorization.

2171506505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498.

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 2171506505 is about 46599.4260157783. The cubic root of 2171506505 is about 1294.9521217820.

The spelling of 2171506505 in words is "two billion, one hundred seventy-one million, five hundred six thousand, five hundred five".