32221661 has 4 divisors (see below), whose sum is σ = 32262300. Its totient is φ = 32181024.

The previous prime is 32221633. The next prime is 32221667. The reversal of 32221661 is 16612223.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29365561 + 2856100 = 5419^2 + 1690^2 .

It is a cyclic number.

It is not a de Polignac number, because 32221661 - 2¹⁸ = 31959517 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 (32221667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19106 + ... + 20723.

It is an arithmetic number, because the mean of its divisors is an integer number (8065575).

Almost surely, 2^32221661 is an apocalyptic number.

It is an amenable number.

32221661 is a deficient number, since it is larger than the sum of its proper divisors (40639).

32221661 is an equidigital number, since it uses as much as digits as its factorization.

32221661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40638.

The product of its digits is 864, while the sum is 23.

The square root of 32221661 is about 5676.4126876047. The cubic root of 32221661 is about 318.2115761679.

Adding to 32221661 its reverse (16612223), we get a palindrome (48833884).

The spelling of 32221661 in words is "thirty-two million, two hundred twenty-one thousand, six hundred sixty-one".