32661721 has 2 divisors, whose sum is σ = 32661722. Its totient is φ = 32661720.

The previous prime is 32661719. The next prime is 32661749. The reversal of 32661721 is 12716623.

It is an a-pointer prime, because the next prime (32661749) can be obtained adding 32661721 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29648025 + 3013696 = 5445^2 + 1736^2 .

It is a cyclic number.

It is not a de Polignac number, because 32661721 - 2¹ = 32661719 is a prime.

Together with 32661719, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 32661721.

It is not a weakly prime, because it can be changed into another prime (32661781) 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 as a sum of consecutive naturals, namely, 16330860 + 16330861.

It is an arithmetic number, because the mean of its divisors is an integer number (16330861).

Almost surely, 2^32661721 is an apocalyptic number.

It is an amenable number.

32661721 is a deficient number, since it is larger than the sum of its proper divisors (1).

32661721 is an equidigital number, since it uses as much as digits as its factorization.

32661721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 28.

The square root of 32661721 is about 5715.0433944109. The cubic root of 32661721 is about 319.6536650115.

The spelling of 32661721 in words is "thirty-two million, six hundred sixty-one thousand, seven hundred twenty-one".