2161225 has 24 divisors (see below), whose sum is σ = 3035520. Its totient is φ = 1512000.

The previous prime is 2161213. The next prime is 2161253. The reversal of 2161225 is 5221612.

It is not a de Polignac number, because 2161225 - 2¹¹ = 2159177 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7840 + ... + 8110.

It is an arithmetic number, because the mean of its divisors is an integer number (126480).

2^2161225 is an apocalyptic number.

2161225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2161225 is a deficient number, since it is larger than the sum of its proper divisors (874295).

2161225 is a wasteful number, since it uses less digits than its factorization.

2161225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 316 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 2161225 is about 1470.1105400615. The cubic root of 2161225 is about 129.2905136587.

Adding to 2161225 its reverse (5221612), we get a palindrome (7382837).

It can be divided in two parts, 216 and 1225, that added together give a palindrome (1441).

The spelling of 2161225 in words is "two million, one hundred sixty-one thousand, two hundred twenty-five".