2172051071 has 4 divisors (see below), whose sum is σ = 2230755192. Its totient is φ = 2113346952.

The previous prime is 2172051067. The next prime is 2172051073. The reversal of 2172051071 is 1701502712.

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

It is a cyclic number.

It is not a de Polignac number, because 2172051071 - 2² = 2172051067 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 2172051071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172051073) 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, 29352005 + ... + 29352078.

It is an arithmetic number, because the mean of its divisors is an integer number (557688798).

Almost surely, 2^2172051071 is an apocalyptic number.

2172051071 is a deficient number, since it is larger than the sum of its proper divisors (58704121).

2172051071 is an equidigital number, since it uses as much as digits as its factorization.

2172051071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58704120.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 2172051071 is about 46605.2687042999. The cubic root of 2172051071 is about 1295.0603612240.

Adding to 2172051071 its reverse (1701502712), we get a palindrome (3873553783).

The spelling of 2172051071 in words is "two billion, one hundred seventy-two million, fifty-one thousand, seventy-one".