2161020175 has 12 divisors (see below), whose sum is σ = 2680354240. Its totient is φ = 1728371520.

The previous prime is 2161020163. The next prime is 2161020179. The reversal of 2161020175 is 5710201612.

It is not a de Polignac number, because 2161020175 - 2²¹ = 2158923023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161020179) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116971 + ... + 134179.

Almost surely, 2^2161020175 is an apocalyptic number.

2161020175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2161020175 is a deficient number, since it is larger than the sum of its proper divisors (519334065).

2161020175 is a wasteful number, since it uses less digits than its factorization.

2161020175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22242 (or 22237 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 2161020175 is about 46486.7741943878. The cubic root of 2161020175 is about 1292.8642912854.

Adding to 2161020175 its reverse (5710201612), we get a palindrome (7871221787).

The spelling of 2161020175 in words is "two billion, one hundred sixty-one million, twenty thousand, one hundred seventy-five".