32721225 has 12 divisors (see below), whose sum is σ = 54099216. Its totient is φ = 17451280.

The previous prime is 32721197. The next prime is 32721229. The reversal of 32721225 is 52212723.

It is a happy number.

It is not a de Polignac number, because 32721225 - 2⁹ = 32720713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 32721195 and 32721204.

It is not an unprimeable number, because it can be changed into a prime (32721229) 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 11 ways as a sum of consecutive naturals, for example, 218067 + ... + 218216.

It is an arithmetic number, because the mean of its divisors is an integer number (4508268).

Almost surely, 2^32721225 is an apocalyptic number.

It is an amenable number.

32721225 is a deficient number, since it is larger than the sum of its proper divisors (21377991).

32721225 is a wasteful number, since it uses less digits than its factorization.

32721225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436296 (or 436291 counting only the distinct ones).

The product of its digits is 1680, while the sum is 24.

The square root of 32721225 is about 5720.2469352293. The cubic root of 32721225 is about 319.8476651232.

Adding to 32721225 its reverse (52212723), we get a palindrome (84933948).

The spelling of 32721225 in words is "thirty-two million, seven hundred twenty-one thousand, two hundred twenty-five".