2171920609 has 16 divisors (see below), whose sum is σ = 2350990080. Its totient is φ = 1999468800.

The previous prime is 2171920607. The next prime is 2171920637. The reversal of 2171920609 is 9060291712.

It is not a de Polignac number, because 2171920609 - 2¹ = 2171920607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (2171920603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 774009 + ... + 776809.

It is an arithmetic number, because the mean of its divisors is an integer number (146936880).

Almost surely, 2^2171920609 is an apocalyptic number.

It is an amenable number.

2171920609 is a deficient number, since it is larger than the sum of its proper divisors (179069471).

2171920609 is a wasteful number, since it uses less digits than its factorization.

2171920609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 2171920609 is about 46603.8690346628. The cubic root of 2171920609 is about 1295.0344318847.

The spelling of 2171920609 in words is "two billion, one hundred seventy-one million, nine hundred twenty thousand, six hundred nine".