2172020217 has 32 divisors (see below), whose sum is σ = 2973003264. Its totient is φ = 1410240000.

The previous prime is 2172020183. The next prime is 2172020237. The reversal of 2172020217 is 7120202712.

It is not a de Polignac number, because 2172020217 - 2⁶ = 2172020153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2172020237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8653342 + ... + 8653592.

It is an arithmetic number, because the mean of its divisors is an integer number (92906352).

Almost surely, 2^2172020217 is an apocalyptic number.

It is an amenable number.

2172020217 is a deficient number, since it is larger than the sum of its proper divisors (800983047).

2172020217 is a wasteful number, since it uses less digits than its factorization.

2172020217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 2172020217 is about 46604.9376890475. The cubic root of 2172020217 is about 1295.0542290812.

Adding to 2172020217 its reverse (7120202712), we get a palindrome (9292222929).

The spelling of 2172020217 in words is "two billion, one hundred seventy-two million, twenty thousand, two hundred seventeen".