2721225 has 24 divisors (see below), whose sum is σ = 4846912.
Its totient is φ = 1339200.
The previous prime is 2721223. The next prime is 2721227. The reversal of 2721225 is 5221272.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (2721223) and next prime (2721227).
It is not a de Polignac number, because 2721225 - 21 = 2721223 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2721223) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 421 + ... + 2370.
22721225 is an apocalyptic number.
2721225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.
It is an amenable number.
2721225 is a deficient number, since it is larger than the sum of its proper divisors (2125687).
2721225 is a wasteful number, since it uses less digits than its factorization.
2721225 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2817 (or 2812 counting only the distinct ones).
The product of its digits is 560, while the sum is 21.
The square root of 2721225 is about 1649.6135911176.
The cubic root of 2721225 is about 139.6115934959.
Adding to 2721225 its reverse (5221272), we get a palindrome (7942497).
The spelling of 2721225 in words is "two million, seven hundred twenty-one thousand, two hundred twenty-five".