7072321 has 2 divisors, whose sum is σ = 7072322. Its totient is φ = 7072320.

The previous prime is 7072277. The next prime is 7072337. The reversal of 7072321 is 1232707.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5948721 + 1123600 = 2439^2 + 1060^2 .

It is a cyclic number.

It is not a de Polignac number, because 7072321 - 2⁷ = 7072193 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 7072292 and 7072301.

It is not a weakly prime, because it can be changed into another prime (7072421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3536160 + 3536161.

It is an arithmetic number, because the mean of its divisors is an integer number (3536161).

Almost surely, 2^7072321 is an apocalyptic number.

It is an amenable number.

7072321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7072321 is an equidigital number, since it uses as much as digits as its factorization.

7072321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 7072321 is about 2659.3835751918. The cubic root of 7072321 is about 191.9496486167.

The spelling of 7072321 in words is "seven million, seventy-two thousand, three hundred twenty-one".