2160121 has 6 divisors (see below), whose sum is σ = 2204510. Its totient is φ = 2116608.

The previous prime is 2160113. The next prime is 2160127. The reversal of 2160121 is 1210612.

It can be written as a sum of positive squares in 3 ways, for example, as 622521 + 1537600 = 789^2 + 1240^2 .

It is not a de Polignac number, because 2160121 - 2³ = 2160113 is a prime.

It is a super-2 number, since 2×2160121² = 9332245469282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2160127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2425 + ... + 3193.

2^2160121 is an apocalyptic number.

It is an amenable number.

2160121 is a deficient number, since it is larger than the sum of its proper divisors (44389).

2160121 is an frugal number, since it uses more digits than its factorization.

2160121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875 (or 822 counting only the distinct ones).

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

The square root of 2160121 is about 1469.7350101294. The cubic root of 2160121 is about 129.2684951216.

Adding to 2160121 its reverse (1210612), we get a palindrome (3370733).

The spelling of 2160121 in words is "two million, one hundred sixty thousand, one hundred twenty-one".