32720718221 has 2 divisors, whose sum is σ = 32720718222. Its totient is φ = 32720718220.

The previous prime is 32720718203. The next prime is 32720718257. The reversal of 32720718221 is 12281702723.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32621416996 + 99301225 = 180614^2 + 9965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32720718221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32720718421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16360359110 + 16360359111.

It is an arithmetic number, because the mean of its divisors is an integer number (16360359111).

Almost surely, 2^32720718221 is an apocalyptic number.

It is an amenable number.

32720718221 is a deficient number, since it is larger than the sum of its proper divisors (1).

32720718221 is an equidigital number, since it uses as much as digits as its factorization.

32720718221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 35.

The spelling of 32720718221 in words is "thirty-two billion, seven hundred twenty million, seven hundred eighteen thousand, two hundred twenty-one".