7321734221 has 2 divisors, whose sum is σ = 7321734222. Its totient is φ = 7321734220.

The previous prime is 7321734209. The next prime is 7321734229. The reversal of 7321734221 is 1224371237.

7321734221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4192562500 + 3129171721 = 64750^2 + 55939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7321734221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7321734229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3660867110 + 3660867111.

It is an arithmetic number, because the mean of its divisors is an integer number (3660867111).

Almost surely, 2^7321734221 is an apocalyptic number.

It is an amenable number.

7321734221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7321734221 is an equidigital number, since it uses as much as digits as its factorization.

7321734221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 32.

The square root of 7321734221 is about 85567.1328314792. The cubic root of 7321734221 is about 1941.8007000117.

The spelling of 7321734221 in words is "seven billion, three hundred twenty-one million, seven hundred thirty-four thousand, two hundred twenty-one".