7030721 has 4 divisors (see below), whose sum is σ = 7202244. Its totient is φ = 6859200.

The previous prime is 7030717. The next prime is 7030729. The reversal of 7030721 is 1270307.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1270307 = 131 ⋅9697.

It can be written as a sum of positive squares in 2 ways, for example, as 1690000 + 5340721 = 1300^2 + 2311^2 .

It is a cyclic number.

It is not a de Polignac number, because 7030721 - 2² = 7030717 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7030693 and 7030702.

It is not an unprimeable number, because it can be changed into a prime (7030729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85700 + ... + 85781.

It is an arithmetic number, because the mean of its divisors is an integer number (1800561).

Almost surely, 2^7030721 is an apocalyptic number.

It is an amenable number.

7030721 is a deficient number, since it is larger than the sum of its proper divisors (171523).

7030721 is a wasteful number, since it uses less digits than its factorization.

7030721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171522.

The product of its (nonzero) digits is 294, while the sum is 20.

The square root of 7030721 is about 2651.5506783767. The cubic root of 7030721 is about 191.5725535016.

The spelling of 7030721 in words is "seven million, thirty thousand, seven hundred twenty-one".