2120161 has 6 divisors (see below), whose sum is σ = 2196662. Its totient is φ = 2046240.

The previous prime is 2120147. The next prime is 2120171. The reversal of 2120161 is 1610212.

It can be written as a sum of positive squares in 3 ways, for example, as 3136 + 2117025 = 56^2 + 1455^2 .

It is not a de Polignac number, because 2120161 - 2¹¹ = 2118113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 420 + ... + 2101.

2^2120161 is an apocalyptic number.

2120161 is the 841-st octagonal number.

It is an amenable number.

2120161 is a deficient number, since it is larger than the sum of its proper divisors (76501).

2120161 is an equidigital number, since it uses as much as digits as its factorization.

2120161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2579 (or 2550 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2120161 is about 1456.0772644335. The cubic root of 2120161 is about 128.4664176653.

Adding to 2120161 its reverse (1610212), we get a palindrome (3730373).

The spelling of 2120161 in words is "two million, one hundred twenty thousand, one hundred sixty-one".