2173216501 has 4 divisors (see below), whose sum is σ = 2185223404. Its totient is φ = 2161209600.

The previous prime is 2173216499. The next prime is 2173216511. The reversal of 2173216501 is 1056123712.

It is a happy number.

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 1035166276 + 1138050225 = 32174^2 + 33735^2 .

It is a cyclic number.

It is not a de Polignac number, because 2173216501 - 2¹ = 2173216499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2173216501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173216511) 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, 6003180 + ... + 6003541.

It is an arithmetic number, because the mean of its divisors is an integer number (546305851).

Almost surely, 2^2173216501 is an apocalyptic number.

It is an amenable number.

2173216501 is a deficient number, since it is larger than the sum of its proper divisors (12006903).

2173216501 is a wasteful number, since it uses less digits than its factorization.

2173216501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12006902.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 2173216501 is about 46617.7702276718. The cubic root of 2173216501 is about 1295.2919445348.

The spelling of 2173216501 in words is "two billion, one hundred seventy-three million, two hundred sixteen thousand, five hundred one".