2181225 has 24 divisors (see below), whose sum is σ = 3650560. Its totient is φ = 1149120.

The previous prime is 2181217. The next prime is 2181227. The reversal of 2181225 is 5221812.

It is a happy number.

It is not a de Polignac number, because 2181225 - 2³ = 2181217 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2181227) 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, 9411 + ... + 9639.

2^2181225 is an apocalyptic number.

2181225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2181225 is a deficient number, since it is larger than the sum of its proper divisors (1469335).

2181225 is a wasteful number, since it uses less digits than its factorization.

2181225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 364 counting only the distinct ones).

The product of its digits is 320, while the sum is 21.

The square root of 2181225 is about 1476.8970851078. The cubic root of 2181225 is about 129.6881083341.

The spelling of 2181225 in words is "two million, one hundred eighty-one thousand, two hundred twenty-five".