32381221 has 4 divisors (see below), whose sum is σ = 32438700. Its totient is φ = 32323744.

The previous prime is 32381207. The next prime is 32381227. The reversal of 32381221 is 12218323.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12218323 = 13 ⋅939871.

It can be written as a sum of positive squares in 2 ways, for example, as 6320196 + 26061025 = 2514^2 + 5105^2 .

It is a cyclic number.

It is not a de Polignac number, because 32381221 - 2⁵ = 32381189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 32381192 and 32381201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32381227) 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 3 ways as a sum of consecutive naturals, for example, 27886 + ... + 29023.

It is an arithmetic number, because the mean of its divisors is an integer number (8109675).

Almost surely, 2^32381221 is an apocalyptic number.

It is an amenable number.

32381221 is a deficient number, since it is larger than the sum of its proper divisors (57479).

32381221 is an equidigital number, since it uses as much as digits as its factorization.

32381221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57478.

The product of its digits is 576, while the sum is 22.

The square root of 32381221 is about 5690.4499822070. The cubic root of 32381221 is about 318.7359672920.

Adding to 32381221 its reverse (12218323), we get a palindrome (44599544).

The spelling of 32381221 in words is "thirty-two million, three hundred eighty-one thousand, two hundred twenty-one".