2172010145 has 4 divisors (see below), whose sum is σ = 2606412180. Its totient is φ = 1737608112.

The previous prime is 2172010091. The next prime is 2172010147. The reversal of 2172010145 is 5410102712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 929518144 + 1242492001 = 30488^2 + 35249^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172010145 - 2⁶ = 2172010081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2172010145.

It is not an unprimeable number, because it can be changed into a prime (2172010147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217201010 + ... + 217201019.

It is an arithmetic number, because the mean of its divisors is an integer number (651603045).

Almost surely, 2^2172010145 is an apocalyptic number.

It is an amenable number.

2172010145 is a deficient number, since it is larger than the sum of its proper divisors (434402035).

2172010145 is an equidigital number, since it uses as much as digits as its factorization.

2172010145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434402034.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 2172010145 is about 46604.8296317023. The cubic root of 2172010145 is about 1295.0522272880.

Adding to 2172010145 its reverse (5410102712), we get a palindrome (7582112857).

The spelling of 2172010145 in words is "two billion, one hundred seventy-two million, ten thousand, one hundred forty-five".