7021313 has 4 divisors (see below), whose sum is σ = 7561428. Its totient is φ = 6481200.

The previous prime is 7021309. The next prime is 7021319. The reversal of 7021313 is 3131207.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3131207 = 569 ⋅5503.

It can be written as a sum of positive squares in 2 ways, for example, as 1227664 + 5793649 = 1108^2 + 2407^2 .

It is a cyclic number.

It is not a de Polignac number, because 7021313 - 2² = 7021309 is a prime.

It is a Duffinian number.

7021313 is a modest number, since divided by 1313 gives 702 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 7021291 and 7021300.

It is not an unprimeable number, because it can be changed into a prime (7021319) 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, 270038 + ... + 270063.

It is an arithmetic number, because the mean of its divisors is an integer number (1890357).

Almost surely, 2^7021313 is an apocalyptic number.

It is an amenable number.

7021313 is a deficient number, since it is larger than the sum of its proper divisors (540115).

7021313 is a wasteful number, since it uses less digits than its factorization.

7021313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540114.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 7021313 is about 2649.7760282711. The cubic root of 7021313 is about 191.4870658685.

The spelling of 7021313 in words is "seven million, twenty-one thousand, three hundred thirteen".