7021213813 has 2 divisors, whose sum is σ = 7021213814. Its totient is φ = 7021213812.

The previous prime is 7021213807. The next prime is 7021213853. The reversal of 7021213813 is 3183121207.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6935225284 + 85988529 = 83278^2 + 9273^2 .

It is a cyclic number.

It is not a de Polignac number, because 7021213813 - 2⁵ = 7021213781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7021213853) 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, 3510606906 + 3510606907.

It is an arithmetic number, because the mean of its divisors is an integer number (3510606907).

Almost surely, 2^7021213813 is an apocalyptic number.

It is an amenable number.

7021213813 is a deficient number, since it is larger than the sum of its proper divisors (1).

7021213813 is an equidigital number, since it uses as much as digits as its factorization.

7021213813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 7021213813 is about 83792.6835290528. The cubic root of 7021213813 is about 1914.8616417978.

The spelling of 7021213813 in words is "seven billion, twenty-one million, two hundred thirteen thousand, eight hundred thirteen".